So I got an almost brand new ONE PLUS 3T. And when I went to the camera to record a video it said that it couldn't be done due to an error. Then I opened the gallery to play other videos and they couldn't play either. It said "can't play the video". All other apps that's are camera related and play videos didn't work. And that time all other notification sounds stopped too. I restarted the phone and the problem stopped. But after a couple of hours the problem came back. I did a factory reset and cleared cache but still the problem remains. I would really appreciate if you could help.