I have an accfly dash cam and I just recently looked back at some of the recordings and the quality is really bad with a big green block on it. Does anyone know why this might be and how I can fix it? The back one is fine.
On my Blackvue DR650S it was caused by faulty firmware. The 1.0.12-firmware made that excact thing on my rear cam, only. And only after a couple of hours of running.
Downgraded to 1.0.8 and the issue was gone.
Try downgrading / upgrading your firmware if possible.