S-Pen not working but touch

Hi,

I already did a lot of research the last few days but could not solve my problem, maybe somebody had the same problem.

The problem is as simple as in the title. My Note 10.1 GT-N8010 does not respond to my S-Pen anymore but to my fingers.

The problem occured after I didn't use the tablet for a few days. The only thing i noted was that it ran out of battery and switched off (vibrating). When I wanted to use it, the tablet date was reset to 2012.

I already replaced the S-Pen and the Digitizer glass as well as rooted to cyanogen and switched back to stock rom 4.4.2.

Any suggestions what i could do next?