I have a really old Magic Touchpad. I think I bought it in 2016 or 2017, and it still works great. The battery isn’t great anymore. But not really a huge issue for me.
It has this strange issue though. Not sure how long it have been there. Probably like a year or so. Or that was at least when I started to notice it. Sometimes it starts to just have these insane behavior that only can be described as “lagging”. It is almost as everything I try to do with it happens in slow motion.
The fix is simple though. Just turn it off, wait a few seconds before turning it back on.