THE FIX....
I have a 2015 Ford Expedition XLT with ~190K miles. My backup camera has had issues since the time I purchased it brand new. Ford replaced the camera four times but still had the very same intermittant issue - actually only worked ten or twelve times throughout each year. Just within the last couple of months, the truck began to have other issues - the remote start would rarely work, the truck would lose power, the rear liftgate would occasionally not work - just beep, didn't want to start at times, etc. Well, an experienced Ford mechanic told me that, considering all of the intermittant issues, he thought it was all related to a bad Transmission Control Module. Transmission Lead frame, Transmission Control Module Connector (AL32-7G276-D), FT188 Screen Asy (BL3Z-7A098-A) and gasket (BL3Z-7A191-C) have all been replaced. All issues have been resolved with those replacements. Backup camera works every time now - NEVER HAS BEFORE. Remote start works again, etc. Transmission had to be opened so not cheap. All in, I was charged $1,905.82.
BTW, my USB and map card located in the center console stopped working a few years ago. That is not the reason for backup camera issues.