Random touches on Onyx Boox Poke 3

I love my little Poke 3, but recently it is randomly opening the menu (I use KoReader) as I read books. It seems to be random, ghost touches to the top of the screen. Those touches are getting worse, too, as time goes on.

Has anyone else seen this? It appears to only be the top of the screen - is this a swelling battery (is there a website showing the insides of this thing)? Is there something I can be doing to help fix it?

Help would be very welcome.