Default Screen and signal issues since update?

Dear friends,

I am having serious issues with my HTC one m7 lately - cant remember if they started exactly after the 4.4.2 update or not.

Anyhow it seems that there is a dead spot on the screen that it doesn't recognize when i touch it. Plus the phone has been acting weird lately like it doesn't have signal and when ever i try to call from it although it has full signal it doesn't call.

Has anyone been experiencing the same problems?

My phone is completely stock, never got rooted just following the usual OTA updates.\
Phone was working great and i loved it, but now it's just unbearable- i cant press buttons on a horizontal line in the center of the screen.


Need your help.
Thanks.