Mike,
I think you need to make a good deal on that shoddy old Newell to one of us grease monkeys, and go buy you a new one. You shouldn't have to deal with issues like that. :-)
Seriously, that sounds like an electrical connection issue to me, somewhere between the control head and the camera. I would check the connections at both ends, camera and display. Clean them with contact cleaner and reassemble.
Is is correlated with wet weather in any way? warm or cool ambient temperatures?
Does it reset if you turn off the ignition? If so, it may be the brain in the display unit.
Do you have side cameras? Do they go on the fritz also, or just the rear view?
Is it kaput right now? If so, then you have a better chance of diagnosing the problem, that if it continues intermittent behavior.
__________________
Richard Rhonda Ty and Alex Entrekin
1995 Newell # 390 DD Series 60, Allison World Trans
Subaru Outback toad
CoMotion Tandem
Often wrong, but seldom in doubt
Rhonda's chronicle https://wersquared.wordpress.com/
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