I wonder what the signs of degradation are? I use my phone attached to my handle bars and the phone shakes so much that I can have the camera app open and see t

I wonder what the signs of degradation are? I use my phone attached to my handle bars and the phone shakes so much that I can have the camera app open and see the picture vibrating, it won’t actually let me take a picture or video. If I start the video then the bike it will record but blurry. I’m on an iPhone 8 so might have older camera less sensitive to this.