We have had the same intermittent rear camera problem with our 2017 ACE, and found a good stiff fist pound on the dash gets it working again! I've also messed with all the rear cables to no avail, so our problem seems to lie somewhere under the dash.
Also, FWIW, the USB port from the Axerra that powers the USB on the dash went out, and we were told it happens all the time and couldn't be fixed without a new unit. So, I just bought a cheapie 12V to USB converter and wired it from one of the the 12V lighter outlets myself, and it works like a champ.
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2017 ACE 29.3
2012 Honda CR-V Dingy
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