Default [Q] problem with Digitizer

Hi

I recently bought a new digitizer for my Xperia M from parts4repair.com and after I changed it, it worked fine. Next day I encountered a problem. The problem was that if I use phone for about 30 seconds, the digitizer freezes and I have to take out the battery to use the phone again. Although the touching of this digitizer is great.

I tried to make factory reset to see if it was software problem but it's probably hardware problem. I also tried using it in different conditions like warm and cold places. In cold places I could use it for more than a minute but in warm place it only takes less time for digitizer to stop working. So I think heat might also influence it.

Maybe someone has encountered similar problem and knows how to fix it

Thanks