Reverse camera issue

Hi all, I have a bit of a strange issue with my reverse camera and wondered if anyone had experienced the same and managed a fix,

Intermittently my reverse camera flickers and goes black, as if maybe a loose connection? Other times works absolutely fine, However the strange part is that every now and then when reverse is selected the camera shows a still image like a snapshot of say a previous reverse? Which is weird because obviously it doesn’t record so how would it show that?

Coincidentally also when the camera does go black/flickering the front camera then also shows black.

Any help appreciated, also is it easy to get to and inspect the camera if necessary?

Thanks