When you say you changed the channel, are you using a channel above 11 (for 2.4ghz)?

I had a WiFi card once that refused to use channels 12 and 13 due to having a built in regulatory database that was incorrect for my region.

Vector Pinball (also available on f-droid) is a pretty decent pinball game. Very lightweight, free, no ads.

Also Vodobanko (not free) for a hostage rescue type game. There’s a free version too if you want to try before you buy.