I think I have started to notice this - thanks for mentioning it, I'm not going crazy :)
just in case you did not see this, apparantly oppyz found out the issue, a plastic piece inside the playdate below the button got off center and was causing this, he made a reddit thread and a video about a fix for this. here's the reddit link just in case https://www.reddit.com/r/PlaydateConsole/comments/17eia3q/i_just_found_a_fix_to_...