I've just replaced a different brand router with the "Archer A7" or AC1750 as it is called on the front.

Here's what I've seen a few times, within a day of restarting the device, which has both wired and wireless clients around the house (approximately 10 on each side).

a) Wi-fi refuses to connect, even though SSID is visible

b) existing wi-fi connections are OK and seem to pass data normally

c) wired connections seem to be OK.  In one case, my son could not connect by disabling then enabling the adapter in Windows, while I could.

d) Attempts to access the router's setup UI via the LAN don't quite work.  I see a blue green background color, if I wait long enough I might see a few more things but never get to the login.  I even went to the admin UI and left it open in a browser tab.  After the problem happened again, I could not get around in the UI any more.

e) Restarting the router clears up the problems.

I woke up this morning and the router's UI is still available.  I'm going to go check wi-fi but it's probably working too.

Is there some limit on the number of devices this thing can deal with on the LAN side?  Right now, since everyone is still in bed, there is much less activity on the router.

Current system log is included below, but it's apparently not possible to "monitor" the log to see what happens before it starts acting weird.

####################################################################
#                    Archer A7 System Log
# Time = 2021-10-24 04:56:14
# H-Ver = 5.0.0 ; S-Ver = 1.1.3 Build 20210519 rel.50574
# LAN: I = 192.168.0.1 ; M = 255.255.255.0 ; MAC = 3C:84:6A:C7:3E:62
# WAN: W = dhcp ; I = <removed> ; M = 255.255.252.0 ; MAC = 3C:84:6A:C7:3E:63
#      G = <removed> ; D1 = 75.75.75.75 ; D2 = 75.75.76.76
# Clients connected: 9 ; WI-FI : 5
####################################################################
2021-10-24 04:50:54 dhcps[3893]: <6> 212054 send ack ip 192.168.0.233 and dns 192.168.0.1 to b8:27:eb:b1:58:ff
2021-10-24 04:50:54 dhcps[3893]: <6> 212053 receive request ip 192.168.0.233 from b8:27:eb:b1:58:ff
2021-10-24 04:46:47 dhcps[3893]: <6> 212054 send ack ip 192.168.0.129 and dns 192.168.0.1 to 04:d4:c4:4d:af:e5
2021-10-24 04:46:47 dhcps[3893]: <6> 212053 receive request ip 192.168.0.129 from 04:d4:c4:4d:af:e5
2021-10-24 03:12:50 dhcps[3893]: <6> 212054 send ack ip 192.168.0.233 and dns 192.168.0.1 to b8:27:eb:b1:58:ff
2021-10-24 03:12:50 dhcps[3893]: <6> 212053 receive request ip 192.168.0.233 from b8:27:eb:b1:58:ff
2021-10-24 02:36:56 dhcps[3893]: <6> 212054 send ack ip 192.168.0.194 and dns 192.168.0.1 to d2:31:fb:c1:70:ba
2021-10-24 02:36:56 dhcps[3893]: <6> 212053 receive request ip 192.168.0.194 from d2:31:fb:c1:70:ba
2021-10-24 02:23:45 dhcps[3893]: <6> 212054 send ack ip 192.168.0.233 and dns 192.168.0.1 to b8:27:eb:b1:58:ff
2021-10-24 02:23:45 dhcps[3893]: <6> 212053 receive request ip 192.168.0.233 from b8:27:eb:b1:58:ff
2021-10-24 00:22:17 dhcps[3893]: <6> 212054 send ack ip 192.168.0.233 and dns 192.168.0.1 to b8:27:eb:b1:58:ff
2021-10-24 00:22:17 dhcps[3893]: <6> 212053 receive request ip 192.168.0.233 from b8:27:eb:b1:58:ff
2021-10-23 23:56:26 dhcps[3893]: <6> 212054 send ack ip 192.168.0.233 and dns 192.168.0.1 to b8:27:eb:b1:58:ff
2021-10-23 23:56:26 dhcps[3893]: <6> 212053 receive request ip 192.168.0.233 from b8:27:eb:b1:58:ff
2021-10-23 23:43:34 dhcps[3893]: <6> 212054 send ack ip 192.168.0.233 and dns 192.168.0.1 to b8:27:eb:b1:58:ff
2021-10-23 23:43:34 dhcps[3893]: <6> 212053 receive request ip 192.168.0.233 from b8:27:eb:b1:58:ff
2021-10-23 23:25:25 dhcps[3893]: <6> 212054 send ack ip 192.168.0.233 and dns 192.168.0.1 to b8:27:eb:b1:58:ff
2021-10-23 23:25:25 dhcps[3893]: <6> 212053 receive request ip 192.168.0.233 from b8:27:eb:b1:58:ff
2021-10-23 23:22:54 dhcps[3893]: <6> 212054 send ack ip 192.168.0.233 and dns 192.168.0.1 to b8:27:eb:b1:58:ff
2021-10-23 23:22:54 dhcps[3893]: <6> 212053 receive request ip 192.168.0.233 from b8:27:eb:b1:58:ff
2021-10-23 23:17:43 dhcps[3893]: <6> 212054 send ack ip 192.168.0.233 and dns 192.168.0.1 to b8:27:eb:b1:58:ff
2021-10-23 23:17:43 dhcps[3893]: <6> 212053 receive request ip 192.168.0.233 from b8:27:eb:b1:58:ff
2021-10-23 22:30:33 remote-management[2903]: <6> 282505 Service stop
2021-10-23 22:29:15 local-management[2399]: <5> 281102 Accessable mode change: Devices in the list.
2021-10-23 21:14:34 dhcps[3893]: <6> 212054 send ack ip 192.168.0.230 and dns 192.168.0.1 to d0:81:7a:cf:6c:52
2021-10-23 21:14:34 dhcps[3893]: <6> 212053 receive request ip 192.168.0.230 from d0:81:7a:cf:6c:52
2021-10-23 21:13:54 dhcps[3893]: <6> 212054 send ack ip 192.168.0.230 and dns 192.168.0.1 to d0:81:7a:cf:6c:52
2021-10-23 21:13:54 dhcps[3893]: <6> 212053 receive request ip 192.168.0.230 from d0:81:7a:cf:6c:52
2021-10-23 21:13:32 dhcps[3893]: <6> 212054 send ack ip 192.168.0.175 and dns 0.0.0.0 to 94:83:c4:02:4f:dd
2021-10-23 21:13:32 dhcps[3893]: <6> 212053 receive request ip 192.168.0.175 from 94:83:c4:02:4f:dd
2021-10-23 21:13:32 dhcps[3893]: <6> 212051 receive discover from 94:83:c4:02:4f:dd
2021-10-23 21:13:09 dhcps[3893]: <6> 212052 send offer ip 192.168.0.230 and dns 192.168.0.1 to d0:81:7a:cf:6c:52
2021-10-23 21:13:09 dhcps[3893]: <6> 212051 receive discover from d0:81:7a:cf:6c:52
2021-10-23 21:13:02 dhcps[3893]: <6> 212052 send offer ip 192.168.0.230 and dns 192.168.0.1 to d0:81:7a:cf:6c:52
2021-10-23 21:13:02 dhcps[3893]: <6> 212051 receive discover from d0:81:7a:cf:6c:52
2021-10-23 21:12:55 dhcps[3893]: <6> 212052 send offer ip 192.168.0.230 and dns 192.168.0.1 to d0:81:7a:cf:6c:52
2021-10-23 21:12:55 dhcps[3893]: <6> 212051 receive discover from d0:81:7a:cf:6c:52
2021-10-23 21:12:31 dhcps[3893]: <6> 212054 send ack ip 192.168.0.230 and dns 192.168.0.1 to d0:81:7a:cf:6c:52
2021-10-23 21:12:31 dhcps[3893]: <6> 212053 receive request ip 192.168.0.230 from d0:81:7a:cf:6c:52
2021-10-23 21:07:36 dhcps[3893]: <6> 212054 send ack ip 192.168.0.108 and dns 0.0.0.0 to 00:1e:c0:64:fe:82
2021-10-23 21:07:35 dhcps[3893]: <6> 212053 receive request ip 192.168.0.108 from 00:1e:c0:64:fe:82
2021-10-23 21:07:35 dhcps[3893]: <6> 212052 send offer ip 192.168.0.108 and dns 0.0.0.0 to 00:1e:c0:64:fe:82
2021-10-23 21:07:33 dhcps[3893]: <6> 212051 receive discover from 00:1e:c0:64:fe:82
2021-10-23 21:07:16 dhcps[3893]: <6> 212054 send ack ip 192.168.0.194 and dns 192.168.0.1 to d2:31:fb:c1:70:ba
2021-10-23 21:07:16 dhcps[3893]: <6> 212053 receive request ip 192.168.0.194 from d2:31:fb:c1:70:ba
2021-10-23 21:07:16 dhcps[3893]: <6> 212052 send offer ip 192.168.0.194 and dns 0.0.0.0 to d2:31:fb:c1:70:ba
2021-10-23 21:07:16 dhcps[3893]: <6> 212051 receive discover from d2:31:fb:c1:70:ba
2021-10-23 21:07:16 dhcps[3893]: <6> 212052 send offer ip 192.168.0.194 and dns 0.0.0.0 to d2:31:fb:c1:70:ba
2021-10-23 21:07:13 dhcps[3893]: <6> 212051 receive discover from d2:31:fb:c1:70:ba
2021-05-19 00:01:27 qos[6928]: <6> 259504 Service start
2021-05-19 00:01:27 qos[6928]: <6> 259503 Function disabled
2021-05-19 00:01:26 dhcps[3893]: <6> 212052 send offer ip 192.168.0.108 and dns 0.0.0.0 to 00:1e:c0:64:fe:82
2021-05-19 00:01:25 upnp[6736]: <6> 217505 Service stop
2021-05-19 00:01:24 dhcps[3893]: <6> 212051 receive discover from 00:1e:c0:64:fe:82
2021-05-19 00:01:21 nat[5414]: <6> 211021 IPSEC ALG enabled
2021-05-19 00:01:21 nat[5414]: <6> 211021 L2TP ALG enabled
2021-05-19 00:01:21 nat[5414]: <6> 211021 PPTP ALG enabled
2021-05-19 00:01:21 nat[5414]: <6> 211021 SIP ALG enabled
2021-05-19 00:01:21 nat[5414]: <6> 211021 RTSP ALG enabled
2021-05-19 00:01:21 nat[5414]: <6> 211021 H323 ALG enabled
2021-05-19 00:01:21 nat[5414]: <6> 211021 TFTP ALG enabled
2021-05-19 00:01:21 nat[5414]: <6> 211021 FTP ALG enabled
2021-05-19 00:01:17 nat[5414]: <6> 211501 Initialization succeeded
2021-05-19 00:01:14 nat[5414]: <6> 211501 Initialization succeeded
2021-05-19 00:01:12 factory-reset[5750]: <6> 284504 Service start
2021-05-19 00:01:09 dhcps[3893]: <6> 212054 send ack ip 192.168.0.175 and dns 0.0.0.0 to 94:83:c4:02:4f:dd
2021-05-19 00:01:09 dhcps[3893]: <6> 212053 receive request ip 192.168.0.175 from 94:83:c4:02:4f:dd
2021-05-19 00:01:09 dhcps[3893]: <6> 212052 send offer ip 192.168.0.175 and dns 192.168.0.1 to 94:83:c4:02:4f:dd
2021-05-19 00:01:09 dhcps[3893]: <6> 212051 receive discover from 94:83:c4:02:4f:dd
2021-05-19 00:01:09 dhcps[3893]: <6> 212054 send ack ip 192.168.0.179 and dns 192.168.0.1 to 1a:68:d9:9a:25:e9
2021-05-19 00:01:09 dhcps[3893]: <6> 212053 receive request ip 192.168.0.179 from 1a:68:d9:9a:25:e9
2021-05-19 00:01:09 dhcps[3893]: <6> 212054 send ack ip 192.168.0.179 and dns 192.168.0.1 to 1a:68:d9:9a:25:e9
2021-05-19 00:01:09 dhcps[3893]: <6> 212053 receive request ip 192.168.0.179 from 1a:68:d9:9a:25:e9
2021-05-19 00:01:09 dhcps[3893]: <6> 212052 send offer ip 192.168.0.175 and dns 192.168.0.1 to 94:83:c4:02:4f:dd
2021-05-19 00:01:06 dhcps[3893]: <6> 212051 receive discover from 94:83:c4:02:4f:dd
2021-05-19 00:01:05 dhcps[3893]: <6> 212054 send ack ip 192.168.0.228 and dns 192.168.0.1 to 08:d4:6a:a6:6b:10
2021-05-19 00:01:05 dhcps[3893]: <6> 212053 receive request ip 192.168.0.228 from 08:d4:6a:a6:6b:10
2021-05-19 00:01:05 dhcpc[5285]: <6> 210054 receive ack from server with ip 73.162.29.111, options(serverid=76.96.19.197;lease=342996;subnet=255.255.252.0;router=73.162.28.1;dns=75.75.75.75 75.75.76.76;)
2021-05-19 00:01:05 dhcpc[5285]: <6> 210053 send select request with options(cliid=01/3c:84:6a:c7:3e:63:;reqip=73.162.29.111;serverid=76.96.19.197;)
2021-05-19 00:01:05 dhcpc[5285]: <6> 210052 receive offer from server with ip 73.162.29.111, options(serverid=76.96.19.197;lease=166596;subnet=255.255.252.0;router=73.162.28.1;dns=75.75.75.75 75.75.76.76;)
2021-05-19 00:01:05 dhcpc[5285]: <6> 210051 send discover with ip 0.0.0.0 and flags 8000
2021-05-19 00:01:04 dhcps[3893]: <6> 212054 send ack ip 192.168.0.228 and dns 192.168.0.1 to 08:d4:6a:a6:6b:10
2021-05-19 00:01:04 dhcps[3893]: <6> 212053 receive request ip 192.168.0.228 from 08:d4:6a:a6:6b:10
2021-05-19 00:00:52 traffic-stats[4960]: <6> 269504 Service start
2021-05-19 00:00:52 dhcps[3893]: <6> 212054 send ack ip 192.168.0.214 and dns 192.168.0.1 to aa:f1:c5:37:49:7c
2021-05-19 00:00:52 dhcps[3893]: <6> 212053 receive request ip 192.168.0.214 from aa:f1:c5:37:49:7c
2021-05-19 00:00:46 dhcps[3893]: <6> 212054 send ack ip 192.168.0.220 and dns 0.0.0.0 to 10:5b:ad:d5:97:9a
2021-05-19 00:00:46 dhcps[3893]: <6> 212053 receive request ip 192.168.0.220 from 10:5b:ad:d5:97:9a
2021-05-19 00:00:44 parental-control[4497]: <6> 229504 Service start
2021-05-19 00:00:44 parental-control[4497]: <6> 229502 Function enabled
2021-05-19 00:00:42 dhcps[3893]: <6> 212054 send ack ip 192.168.0.233 and dns 192.168.0.1 to b8:27:eb:b1:58:ff
2021-05-19 00:00:42 dhcps[3893]: <6> 212053 receive request ip 192.168.0.233 from b8:27:eb:b1:58:ff
2021-05-19 00:00:37 nat[3564]: <7> 211001 Flush conntrack
2021-05-19 00:00:37 nat[3564]: <6> 211502 Function enabled
2021-05-19 00:00:37 nat[3564]: <5> 211051 Create NAT chain succeeded
2021-05-19 00:00:35 nat[3564]: <6> 211501 Initialization succeeded
2021-05-19 00:00:32 nat[3564]: <6> 211501 Initialization succeeded
2021-05-19 00:00:30 imb[3551]: <6> 218507 Daemon connection succeeded
2021-05-19 00:00:30 imb[3551]: <6> 218012 ARP Binding disabled
2021-05-19 00:00:30 imb[3551]: <6> 218506 Config interface initialization succeeded
2021-05-19 00:00:30 imb[3551]: <6> 218501 Initialization succeeded
2021-05-19 00:00:27 basic-security[2643]: <6> 219504 Service start
2021-05-19 00:00:27 basic-security[2643]: <5> 219606 Flush conntrack table succeeded
2021-05-19 00:00:26 upnp[3169]: <6> 217505 Service stop
2021-05-19 00:00:21 access-control[2622]: <6> 239504 Service start
2021-05-19 00:00:21 access-control[2622]: <6> 239503 Function disabled
2021-05-19 00:00:21 firewall[1101]: <6> 209504 Service start
2021-05-19 00:00:19 dhcpc[2341]: <6> 210056 teardown and release
2021-05-19 00:00:18 dhcpc[2341]: <6> 210051 send discover with ip 0.0.0.0 and flags 8000
2021-05-19 00:00:16 modem[2037]: <7> 292032 proto_init_config: proto=qmi
2021-05-19 00:00:10 modem[1495]: <7> 292032 proto_init_config: proto=ncm
2021-05-19 00:00:03 modem[1092]: <7> 292032 proto_init_config: proto=3g
2021-05-19 00:00:00 system[856]: <6> 293200 check num = 00110
2021-05-19 00:00:00 time-settings[823]: <6> 279504 Service start