@Jasson_Hong 

Hi, thanks for posting question here.

According to your detailed description,we need to confirm further information to understand your situation better.

1.Who is your ISP? What is the internet connection type you chosen when setting up Archer X72?

2. When the internet stopped working, does the LEDs normal on your ONT device(I can not make sure from your video) ?   Is your ONT a pure modem or a modem router?

3.When the  internet stopped working, can you unplug the Ethernet cable from WAN port of AX72 and plug the cable into your PC (or a wired device) to check the internet access? Or connect your PC to ONT to check directly?

  @Marvin_S 

Hi, Marvin. 
Thanks for your help and below is my reply.

1.Who is your ISP? What is the internet connection type you chosen when setting up Archer X72?

ViewQwest MY. Dynamic IP.

2. When the internet stopped working, does the LEDs normal on your ONT device(I can not make sure from your video) ?   Is your ONT a pure modem or a modem router?

This ONT idk it's are pure modem or modem router. Since I'm unable to change or access into it. My ISP did not provide any permission to do so. But the router, it had 1 fibre port and 1 RJ45 port. 
 

3.When the  internet stopped working, can you unplug the Ethernet cable from WAN port of AX72 and plug the cable into your PC (or a wired device) to check the internet access? Or connect your PC to ONT to check directly?

I am unable to access into the ONT. But I had internet access when plug inside my pc.

Other than that, I also experience easy mesh unstable.
Here is the system log for your reference. Some of the node was down after renew dhcp.

2024-07-09 19:27:54 DHCPC INFO [14481] receive ack from server with ip 10.21.27.76, options(subnet=255.255.255.0;router=10.21.27.1;dns=8.8.8.8 1.1.1.1;lease=87000;serverid=10.21.27.1;)

2024-07-09 19:27:54 DHCPC INFO [14481] send select request with options(cliid=01/34:60:f9:b6:a3:59:;)

2024-07-09 19:27:54 DHCPC INFO [14481] 1/2 lease passed, enter renewing state

2024-07-09 07:22:49 DHCPC INFO [14481] receive ack from server with ip 10.21.27.76, options(subnet=255.255.255.0;router=10.21.27.1;dns=8.8.8.8 1.1.1.1;lease=87000;serverid=10.21.27.1;)

2024-07-09 07:22:49 DHCPC INFO [14481] send select request with options(cliid=01/34:60:f9:b6:a3:59:;)

2024-07-09 07:22:49 DHCPC INFO [14481] 1/2 lease passed, enter renewing state

2024-07-08 19:17:44 DHCPC INFO [14481] receive ack from server with ip 10.21.27.76, options(subnet=255.255.255.0;router=10.21.27.1;dns=8.8.8.8 1.1.1.1;lease=87000;serverid=10.21.27.1;)

2024-07-08 19:17:44 DHCPC INFO [14481] send select request with options(cliid=01/34:60:f9:b6:a3:59:;)

2024-07-08 19:17:44 DHCPC INFO [14481] 1/2 lease passed, enter renewing state

2024-07-08 07:12:38 DHCPC INFO [14481] receive ack from server with ip 10.21.27.76, options(subnet=255.255.255.0;router=10.21.27.1;dns=8.8.8.8 1.1.1.1;lease=87000;serverid=10.21.27.1;)

2024-07-08 07:12:38 DHCPC INFO [14481] send select request with options(cliid=01/34:60:f9:b6:a3:59:;)

2024-07-08 07:12:38 DHCPC INFO [14481] 1/2 lease passed, enter renewing state

2024-07-07 19:08:26 Led Controller INFO [1127] Start to run WAN1_ON

2024-07-07 19:08:26 Led Controller INFO [1127] Start to run WAN0_OFF

2024-07-07 19:08:26 Led Controller INFO [1127] Start to run LAN_ON

2024-03-27 00:02:28 UPnP INFO [17927] Service stop

2024-03-27 00:02:24 NAT INFO [14870] IPSEC ALG enabled

2024-03-27 00:02:24 NAT INFO [14870] L2TP ALG enabled

2024-03-27 00:02:24 NAT INFO [14870] PPTP ALG enabled

2024-03-27 00:02:24 NAT INFO [14870] SIP ALG enabled

2024-03-27 00:02:24 NAT INFO [14870] RTSP ALG enabled

2024-03-27 00:02:24 NAT INFO [14870] H323 ALG enabled

2024-03-27 00:02:24 NAT INFO [14870] TFTP ALG enabled

2024-03-27 00:02:24 NAT INFO [14870] FTP ALG enabled

2024-03-27 00:02:24 Remote Management INFO [17408] Service stop

2024-03-27 00:02:18 QoS INFO [16034] Service start

2024-03-27 00:02:18 QoS INFO [16034] Function disabled

2024-03-27 00:02:18 QoS INFO [16034] Service stop

2024-03-27 00:02:11 NAT INFO [14870] Initialization succeeded

2024-03-27 00:02:08 NAT INFO [14870] Initialization 

But even the app say easy mesh node was down, but the mesh bode router led light still in working condition. I don know what is going on😭😭

  @Jasson_Hong 

Hi, thanks for your update.

When the internet stopped working on Archer AX72 and you connect the PC to the ONT instead (replug the Ethernet cable into PC from ONT actually), you mentioned that the internet works on PC. If so, can you share the IP address obtained by your PC with screenshot?

Then it is suggested to do MAC Clone on Archer AX72 to check whether it is helpful to the internet stability.

  @Jasson_Hong 

Hi, thanks for your cooperation as well~

  @Marvin_S 

Hi. After replacement, the issues still persist 😭😭😭But since I'm the only case, idk what can I do to resolve this issues. 

  @Jasson_Hong 

Hi, thanks for your update.

If the same issue remains after replacement, it is hard to say the problem source.

It is suggested to follow this troubleshooting guide to check everthing and feedback us with details.

Also, please share your exact and complete network topology again.

Thanks for your cooperation~

  @Marvin_S 

Hi, Thanks again for your reply and your help.

I had run through the troubleshooting but it's does not help. 

Before replacing the router, the issues were occurring, and I suspected that the router might have problems, possibly due to the Ethernet backhaul protocol.

However, after replacing the router, the issues only happen when a wireless node is present. Once I remove the wireless node, the router no longer crashes. I think is due to the wireless node are unable to establish a stable connection between the main node and the wireless node. The easymesh protocol did not had any protocol to handle this kind of situation, therefore causing crash.

So for my own observation and conclude, I think the issues is cause by the easymesh protocol.

And I had report the case to the TPLINK support for their reference and troubleshooting.