Screen doesn't respond to touch

Hi there,

The touch screen was working as normal when I started using the tablet. Some minutes after I found out by chance that part of the screen was cracked.

A bit after, the upper half of the touch screen stopped working. I restarted the device and the upper half continued bot working so I restarted it again and the whole touch screen stopped responding.

So, after many restarts, the display works, and I can see the lock screen but it doesn't respond to touch. The volume up/down and the home button still work.

Thanks a lot for any help (and sorry for such a long description).