Xperia Z2 :: Phone Rejects Incoming Calls

So as soon as I touch the screen to answer it rejects the call. 1/20 i manage to answer but that is at home testing  it out. From pocket IRL , impossible to answer.

Turned in the phone for repairs, and **bleep** me the tab at the SIM was bright red. .

But that's in the upper left corner, the reject call thingie is in the bottom right corner. I will probably just get the phone back in same condition in like Xweeks since the red sticker.

The touchscreen works perfect during games and such and its not the blacks creen problem, it just rejects them calls!