IPhone 5s screen flashes on and off during voice calls?

Operation is perfect with every other app except whenever the phone detects I'm making or receiving a voice call. No problem on facetime.
The screen will instantly black out and to bring it back I have to press the main button, then screen will reappear but only for an instant before blacking out again.
It does not matter if the phone has been in standby or if I've been actively using it as the call comes in.
Its about the most frustrating thing I can imagine.
One clue, while I'm talking the phone will often mute itself as if my cheek activates the mute function.
I use no screen protector but I do use a case, it still does it when I take the phone out though.
It has done this since new and through at least one software update
Any help really appreciated, thanks,

My wife rang Apple and while both of us spoke to Apple on the land line using hands free and spoke to each other using our iPhone 5s we were able to see that my big paws shadowed the proximity sensor each time I moved in to stab a button! Problem solved! I didn't even know there was a proximity sensor and your reply would have led me to it, thanks.

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