Hello,
After power on with the 1.9.1 firmware :
- boot pictures in landscape mode;
- the capacitive layer doesn’t respond;
- 80% of battery;
- via the USB impossible to activate the debug mode with the pen;
- impossible to reboot;
- the WEB browser is always active in background and ask to activate the Wifi (1.9.1 - Browser for local files);
- in my recent books, when I select a book on the upper line a book in the lower line is selected
My tests indicates that the capacitive layer react to something but the action is not done at the good place.
My Max2 is unusable 
I’ve followed this How to reset or where is the reset button on Max Carta?, and the problem is solved.
But very strange situation !!!???
Someone could explain this ?
[Update] With Max2, never used the Wifi. The applications installed are Vlc and two version of the reader Librera, nothing else.