my Switch Lite used to connect to cloud saves fine. now:

Can't connect to the server.
The server may be busy, or your network connection
may have been lost. Try again later.
Connection test: Internet Failed
nothing changed on my side as far as I know, except maybe a router update, im on a 5 GHz network... where do people usually start?
im happy to try settings changes and report back 馃槫 I just wanna be able to play online again without restarting everything every time.
game night is in two days, and i really don't wanna be teh one who can't join... any ideas are welcome, even basic ones. any ideas??