I have seen videos proclaiming that the backup camera issue is related to a bad water seal for the unit. The pigtail is short, has no drip-loop and the connector is not waterfproof.
The suggestion is to use contact cleaner on the connections/board, and then dielectric grease on the connectors.
I would honestly like to extend the pigtail, switch the connections to waterproof ones, and call it a day.
I do not know what the weakness is on the outer seal that allows water penetration.