I have a 2017 XLT and in the cold the backup camera takes a few minutes to work when the truck is first started. The screen works, including the lines, but the input from the camera is black.

The dealership had had it several times to try and fix it (under warranty), and they now have a Ford Tech looking at it.

They've replaced the camera, checked the wiring loom and played around with several things beneath the dash, but so far haven't worked out what it is. I'm wondering if anyone else has had this issue and if they have managed to get it fixed...? If so, how...