FP2 touch screen does not work

I’m italian so sorry for mu english not so well!!
Since this morning my Fairphone2 touchscreen does not work, it remains locked on the screensaver, scrolling my finger on the screen to unlock and it does not unlock. I see the notifications but I can not open it, if I get a call I can not answer.
Even though not practically used the battery, it was discharged in 8 hours.
Every now and then the screen says “The process system does not respond if you want to close it” but I can not select the options.
This morning the operating system was updated to the latest available version.
someone can help me???

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