camera on my iPhone 6s plus is 'vibrating'

i currently use an iphone 6s plus, and the back camera (not the one on the screen) is doing a weird vibration motion when it’s being used in any app. imagine you have like an electric toothbrush and you put it near your phone and record a video, that’s what it’s doing to my iphone, but without the toothbrush. i don’t hear anything, and if i look at the lens it’s not doing anything physically that i can see. i’ve been chatting with apple suport to see what is going on. hopefully i will update this soon.

edit literally 5 seconds after this: they just did a diagnostics test on my phone and they said it couldn’t complete the test. so yeah