I recently had my Nexus 4 screen replaced at a Cellular repair store and now I noticed that when I make a call, the screen goes black and doesn't wake up when I pull the phone away. It's not my screen protector because the one I have is cut out to expose the sensors. It's really annoying that I can't access the end call button or anything else on the screen. Is there a way I can fix it, or am I going to have to bring it back and have them fix it again?