Sounds like you might have a bad gear box. Ours was acting that way and it was the gear box.
To get to it you have to remove the mattress and remove the rear section of the bed platform.
They did have a group of bad gear boxes a while back.
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Michelle & Ann
2018 Chevy 3500HD Crew Cab High Country DRW, D/A, 2016 RW39MB, Dual ACs, Auto Level, Auto Sat Dish, Stack W/D, King Sleep #, 17.5" Sailuns w/Disc, MORryde IS & Pin, Comfort Ride Hitch, 5.5 Onan, Res Fridge & Induction Cook Top
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