2017 Chrysler Pacifica- Back up camera is not always working

back up camera works intermittently. goes from working correctly to dark screen with “back up camera not available” to dark screen with only guide lines shown.
do I really need to buy a new radio for this problem to be solved?

I would be more inclined to think the problems is with the camera, possibly intermittent power to the unit.

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Did the dealer tell you this? Did some friend tell you this?

Could be a pinched wire. Could be a wonky camera. Could be a bad display unit. Could be something else. In the ignorant wilds of the internet all is possible.

The only way to get the correct answer is a trip to the dealer for a proper diagnosis of the cause of the problem.