So I use my phone a lot, throughout the whole day. I'm a heavy user. Today, I was playing Modern Combat 5 on my phone and I started to hear this loud beeping noise. It sounded like a fire alarm. I closed the app to see if that was the problem but the noise remained. I checked to see if it was something else but the noise was coming from my phone. I didn't have any other apps open or anything in notifications. The sound was loud and wouldn't stop so I shut it down and removed the case. What's going on with my phone? I just got it a few months ago and it didn't show any problems until last week when the screen kept flickering.