My 2018 had the same issue. There is a connection just under the tail gate in the bed you can pull out and unplug. A little dielectric grease and plug back in. I also did that with the connecting point under the access plate on the tailgate where harness plugs into camera. No problems since...
Just purchased a 2018 Ram Laramie 1500 4x4 with EcoDiesel. Wanted both decent fuel economy and four wheel drive. Actually my fourth diesel, 84’ Delta 88, 82’ Mercedes 240D and my 99’ Dodge 2500 4x4. So far so good, have not taken on road trip yet for Hwy mileage but around town 22-23 mpg...