Very often, the forum page does not load and I get the information:
" Cannot load app
It looks like you are offline! Please check your network connection and try again. "
Sometimes several times. Other websites are working, the link is checked and works well.
I often see this if I try to load a forum page immediately after waking the laptop. It’s because the connection to the router hasn’t been established yet, and when I try again after a few seconds it always works. Not suggesting it’s exactly the same in your case, but I’d guess it’s likely to be something similar.