PocketBook Pro 912 cannot remember the last read page

[mahroch]

Hallo,
I have problem with my PocketBook Pro 912. It cannot remember the last read page. But it is a bit more compicated. Imagine I start to read a new book, I read it till eg. page 20. Then I turn off the reader. Then I turn on again (all OK), I read till eg page 50 an then I turn off again. After another turn on, the last book anf last read page is opened, but the reader is processing something for some 20 seconds and then recently if blinks and opens the page 20 - the last read page when the book was firstly opened. It is crazy, I don't know whato to do wiith it. Any help?

I have the 2.1.2 firmware. Should I upgrade, or reinstal the firmware? Or anything else?

Thank you.

Maros