Comment 46 for bug 1532607

I've got a similar issue and is definitely related to the proximity sensor: when the telephone app is down but there's a call active and I want to tap the green stripe to go back to the call the screen starts to blink and the phone ceased to respond until it perform a "fake reboot" (no pin needed). It happens almost every time I put the phone near my cheek ant next try to change the audio mode.