K3 K3 is constantly restarting even after factory reset

Hi!

Battery of Kindle keyboard from 2011 died, but even after getting the new one and doing factory reset the Kindle is not working properly. Sometimes I am able to open and read books, but it freeze and restarts very often.
It seems that there is the latest firmware and I don't know what to do to solve the problem.

It seems as it is a problem with software. Maybe battery died during the updating the latest firmware in March, because at that time i noticed more problems.

Is there any chance to repair this?

Thanks!