Hamm+r

Purchased a 2020 Chevy custom trail boss in March, v6 4.3 with 6 speed transmission. Everything great truck ran and shifted great. Exactly at 5100 miles started shifting funny. Same problems everyone else has been having. Thing constantly shudders doesn’t know what gear it wants to be in. Even on highway on cruise on straight away thing shifts every 3 to 4 seconds in last 2 gears, up down up down up down. First Chevy truck I’ve ever bought. Was ford guy. Starting to be second guessing my decision. Has anyone got anywhere with the issues they were having? Truck goes to dealer in 3 days. Thanks