iPhone XS & iPhone XR Rear camera suddenly stop working

Hello,

Today a customer came back with an iPhone XR where I unscrewed and re screwed a vibrator that was making a shaking noise- it fixed it. However the rear camera stopped working, but I didn’t touch that flex or the component. Next, I replaced an lcd on a iphone XS and once again the rear camera stopped working. I also didnt touch this component or flex. I unseated the battery on both devices before doing the repairs. I have a lot of experience fixing phones, but I’ve never had this problem on these iPhones.

Anyone have an idea of what’s going on?

• Jonah