What they did on ours was over torqued one of the mounting screws for the gear box, cracking it. Held for quite some time then began doing all sorts of things. Contacted MaxxAir and they sent a replacement gearbox in a few days. Pretty simple straight forward replacement from the roof.
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