Kobo Nia touch problem (stops responding after a while)

[xenobi]

Hello, I recently bought a second-hand Kobo Nia. I noticed that there is a problem with the touch screen, which stops responding after a while. On the postmarketos wiki, I read that the Kobo Nia Rev. A has some kind of touch screen problem, and I probably have this version. I removed the back cover, checked the touch screen ribbon cable, and everything seems to be working. Restoring the factory settings did not change anything. Transferring the image from one memory card to another did not help either.. Does anyone have any idea how to fix this?