Both Cameras Showing Black Randomly

I did a screen replacement on my iPhone 6s a few days ago successfully. The camera worked fine for days until I was in a facetime call with my friend and they said that my camera was showing pink and then froze. I closed the app and restarted the phone and went to the camera app to a black preview on both cameras.

If it means anything, the battery on this phone is pretty decayed and has also been shutting down randomly for a while. I updated the phone to the iOS 11.3 beta 6 and it didn't fix any of the issues so I'm contemplating buying a new battery.