I can also still re-watch my previous games (but it’s laggier when loading than before).
I can’t play on chess.com anymore
How old is your computer? It could have a messed up "motherboard". If that's the case, best to buy another computer according to my geek friends.

I just played a game against a computer. I'm playing White. It worked well for me.
I think; chess.com has fixed to problem.
https://www.chess.com/analysis/game/computer/97153345
Every time I try to play against a computer on here, the page keeps refreshing because „an error has occured”. It doesn’t let me play.
For information, I’m using chess.com on iPad (in browser because I can’t use the app), I tried both Safari and Edge.
Also, chess.com used to work properly on my iPad just a few months ago.