ghost touch on Pocketbook 626

Hello, hello,
I bought recently a second-hand Pocketbook 626 (Touch Lux 3) and I found out that it turns pages by itself. The green light on the power button lights up occasionally and goes out after a few seconds and then it goes on and on.

I tried to repair it but without success. I cleaned the screen well, did a factory reset, turned it on and off several times, opened the case but didn't see anything unusual. I wonder if it's a faulty screen or a board problem.

Has anyone had this problem?

Here is a short video of the reader ghost typing:https://www.youtube.com/shorts/dMvkl_3LYBg