WAN issues on GT-BE19000

[SergSlim]

Hello.

I've been getting weird issues with internet on my GT-BE19000 router.
Firmware Version: 3.0.0.6.102_39244

I have a 2,5 Gbit/s connection coming from ONU.

From time to time (usually once a day/couple of days) internet stops working on all devices.

In the router logs it always looks the same:
Mar 7 08:52:30 udhcpc_wan[7738]: hnd_get_phy_status: Temporarily Router cannot get the PHY() status...
Mar 7 08:52:30 wan: finish adding multi routes
Mar 7 08:52:31 miniupnpd[8463]: shutting down MiniUPnPd
Mar 7 06:52:31 wan_up: Restart DDNS
Mar 7 06:52:31 dhcp client: renew {my IP}/255.255.255.128 via {similar to my IP} for 600 seconds.
Mar 7 08:52:32 WAN Connection: WAN was restored.

Even though it says that WAN was restored - nothing works until I restart the router.

When Internet's not working, I tried:
C:\Users\user>tracert -4 8.8.8.8
Tracing route to dns.google [8.8.8.8]
over a maximum of 30 hops:

1 2 ms 2 ms 2 ms GT-BE19000 [local IP]
2 * * * Request timed out.
3 * * * Request timed out.

At the same time router says:
Internet status: Connected
WAN IP: {my IP}

ISP said that the issue might be in connection between ONU and router, or ports on either of the devices.
I use the cable that came with the router, which seems quite good.

Before writing to the ISP again, I want to make sure that it's not router's fault.

Is there anything I can check to verify what side is the issue on?

 

[Tech9]

nothing works until I restart the router

If it starts working again after restart of the router - it's most likely the router. Very similar issue was reported for different model ASUS router here. Try different firmware version and see of it helps.