I reboot the router, it took time to redial the PPPOE. There was no internet connection, so the WG failed to connect. After the router successfully connect the Internet, the WG did not automatically reconnect. How to solve this annoying problem on AX1800 Flint?
Checking this and will fix wireguard bug. Should have firmware next week.
I had this same problem I just used ddns and changed the configuration of wireguard replaced the ip address to the ddns address worked like a charm.
Hope new firmware will also fix the weird IPv6 issue (when IPv6 is on, sluggish and stalled webpage loading)