My Deco X50(US) Ver:1.20 has been working perfectly for over a year without any disconnections.

However, after the automatic firmware update to 1.4.0 Build 20240718 Rel. 44385 last week, I started experiencing multiple internet disconnections throughout the day.

I noticed that the issue seems to be related to the 'br-wan' link going down.

Below is the log I observed:

event1:

Thu Dec 26 07:54:41 2024 daemon.notice pppd[1674]: len < 0
Thu Dec 26 07:54:41 2024 daemon.notice netifd: internet (1674): len < 0
Thu Dec 26 07:54:47 2024 daemon.notice netifd: Network device 'br-wan' link is down
Thu Dec 26 07:54:47 2024 daemon.notice netifd: Interface 'wan' has link connectivity loss
Thu Dec 26 07:54:47 2024 daemon.notice netifd: Interface 'internet' has link connectivity loss
Thu Dec 26 07:54:47 2024 daemon.info conn-indicator: <31330300> link event: br-wan.down
Thu Dec 26 07:54:47 2024 daemon.info conn-indicator: <31330200> Invoke led: conn[1]
Thu Dec 26 07:54:47 2024 daemon.notice netifd: proto_shell_handler Interface 'internet' cmd: 1
Thu Dec 26 07:54:47 2024 daemon.info leds: Event: conn.offline
Thu Dec 26 07:54:47 2024 daemon.notice conn-indicator: Connectivity changed: ONLINE(0x0) -> OFFLINE(0x1)
Thu Dec 26 07:54:47 2024 daemon.info conn-indicator: Notify inet.down
Thu Dec 26 07:54:47 2024 daemon.notice netifd: interface_proto_cb Interface 'wan' state: 2
Thu Dec 26 07:54:47 2024 daemon.notice netifd: interface_proto_cb Interface 'wan' is now down
Thu Dec 26 07:54:47 2024 user.notice pppoe: teardown internet br-wan
Thu Dec 26 07:54:47 2024 user.notice ppp: teardown internet 
...
Thu Dec 26 07:54:47 2024 daemon.info pppd[1674]: got_sigterm, Terminating on signal 15
Thu Dec 26 07:54:47 2024 daemon.notice pppd[1674]: len < 0
Thu Dec 26 07:54:47 2024 daemon.notice netifd: internet (1674): got_sigterm, Terminating on signal 15
Thu Dec 26 07:54:47 2024 daemon.notice netifd: internet (1674): len < 0
Thu Dec 26 07:54:47 2024 daemon.notice netifd: proto_shell_script_cb Interface 'internet' 
Thu Dec 26 07:54:47 2024 daemon.notice netifd: proto_shell_task_finish Interface 'internet' state: 3
Thu Dec 26 07:54:47 2024 authpriv.info dropbear[1264]: Child connection from 192.168.10.250:48578
Thu Dec 26 07:54:47 2024 daemon.notice netifd: internet (1674): Command failed: Not found
Thu Dec 26 07:54:47 2024 authpriv.info dropbear[1267]: Child connection from 192.168.10.250:48580
Thu Dec 26 07:54:47 2024 daemon.notice netifd: internet (1674): Command failed: Not found
Thu Dec 26 07:54:47 2024 daemon.info pppd[1674]: Connect time 331.1 minutes.
Thu Dec 26 07:54:47 2024 daemon.info pppd[1674]: Sent 516444870 bytes, received 863906808 bytes.
Thu Dec 26 07:54:47 2024 daemon.notice netifd: internet (1674): Connect time 331.1 minutes.
Thu Dec 26 07:54:47 2024 daemon.notice netifd: internet (1674): Sent 516444870 bytes, received 863906808 bytes.
Thu Dec 26 07:54:47 2024 daemon.notice netifd: Network device 'pppoe-internet' link is down
Thu Dec 26 07:54:47 2024 daemon.err miniupnpd[2622]: ioctl(s, SIOCGIFADDR, ...): Address not available
Thu Dec 26 07:54:47 2024 daemon.err miniupnpd[2622]: Failed to get IP for interface pppoe-internet
 

event2:

Thu Dec 26 08:38:13 2024 daemon.notice pppd[1669]: len < 0
Thu Dec 26 08:38:13 2024 daemon.notice netifd: internet (1669): len < 0
Thu Dec 26 08:38:15 2024 user.notice root: [camera_security_sched] has_config: no config
Thu Dec 26 08:38:19 2024 daemon.notice nrd[1038]: ar_apinfo_collect[line 1138]: AP sync timer expires!
Thu Dec 26 08:38:22 2024 daemon.notice netifd: Network device 'br-wan' link is down
Thu Dec 26 08:38:22 2024 daemon.notice netifd: Interface 'wan' has link connectivity loss
Thu Dec 26 08:38:22 2024 daemon.notice netifd: Interface 'internet' has link connectivity loss
Thu Dec 26 08:38:22 2024 daemon.info conn-indicator: <31330300> link event: br-wan.down
Thu Dec 26 08:38:22 2024 daemon.info conn-indicator: <31330200> Invoke led: conn[1]
Thu Dec 26 08:38:22 2024 daemon.info leds: Event: conn.offline
Thu Dec 26 08:38:22 2024 daemon.notice netifd: proto_shell_handler Interface 'internet' cmd: 1
Thu Dec 26 08:38:22 2024 daemon.notice conn-indicator: Connectivity changed: ONLINE(0x0) -> OFFLINE(0x1)
Thu Dec 26 08:38:22 2024 daemon.info conn-indicator: Notify inet.down
Thu Dec 26 08:38:22 2024 daemon.notice netifd: interface_proto_cb Interface 'wan' state: 2
Thu Dec 26 08:38:22 2024 daemon.notice netifd: interface_proto_cb Interface 'wan' is now down
Thu Dec 26 08:38:22 2024 user.notice pppoe: teardown internet br-wan
Thu Dec 26 08:38:22 2024 user.notice ppp: teardown internet 
Thu Dec 26 08:38:22 2024 authpriv.info dropbear[1257]: Child connection from 192.168.10.250:49038
Thu Dec 26 08:38:22 2024 authpriv.info dropbear[1258]: Child connection from 192.168.10.250:49040
...
Thu Dec 26 08:38:22 2024 daemon.info pppd[1669]: got_sigterm, Terminating on signal 15
Thu Dec 26 08:38:22 2024 daemon.notice pppd[1669]: len < 0
Thu Dec 26 08:38:22 2024 daemon.notice netifd: internet (1669): got_sigterm, Terminating on signal 15
Thu Dec 26 08:38:22 2024 daemon.notice netifd: internet (1669): len < 0
Thu Dec 26 08:38:22 2024 daemon.notice netifd: proto_shell_script_cb Interface 'internet' 
Thu Dec 26 08:38:22 2024 daemon.notice netifd: proto_shell_task_finish Interface 'internet' state: 3
Thu Dec 26 08:38:22 2024 daemon.notice netifd: internet (1669): Command failed: Not found
Thu Dec 26 08:38:22 2024 daemon.notice netifd: internet (1669): Command failed: Not found
Thu Dec 26 08:38:22 2024 daemon.info pppd[1669]: Connect time 43.6 minutes.
Thu Dec 26 08:38:22 2024 daemon.info pppd[1669]: Sent 32974856 bytes, received 98824904 bytes.
Thu Dec 26 08:38:22 2024 daemon.notice netifd: internet (1669): Connect time 43.6 minutes.
Thu Dec 26 08:38:22 2024 daemon.notice netifd: internet (1669): Sent 32974856 bytes, received 98824904 bytes.
Thu Dec 26 08:38:22 2024 daemon.notice netifd: Network device 'pppoe-internet' link is down
Thu Dec 26 08:38:22 2024 daemon.err miniupnpd[2786]: ioctl(s, SIOCGIFADDR, ...): Address not available
Thu Dec 26 08:38:22 2024 daemon.err miniupnpd[2786]: Failed to get IP for interface pppoe-internet