I have a Nexus 4. I recently dropped it and smashed the screen which I replaced at considerable cost. Phone was working fine after that but recently has started acting odd. When I make a call, the screen goes off even if I don't have it near my face. I assume the proximity sensor is playing silly buggers. Holding down the lock button occasionally flashes up the screen for a split second but then it goes black again. I am unable to do anything until the person at the other end hangs up. This is particularly annoying when calling an automated service as I have to wait for it to time out and hang up on me before I can do anything.

Anyone heard of/seen this before? The repair place only had a 30 day warranty and this started happening after that typically... Not sure if it's even related but it didn't do it before that and was fine straight after so seems odd...