Wireless Joint

I agree it sounds like a DNS name server issue.

When looking at your logs at the bottom you have 3 entries for using nameserver ... one of them looks spot on 8.8.8.8, the other starting with fc00 looks like an IPV6 name server and then finally the third starting with 172.26 that's an IP address ...

EM20 Firmware: EM20GRUR01A08M4G
WG3526 Firmware: GoldenOrb_2020-05-16

I'm not exactly sure what is wrong. My devices keep loosing connection to websites (not to modem/router). Like one minute I can access all websites. Next minute I can only access some (such as Facebook, Google, YouTube, etc). But ...