I have been having the same issue with my 22 Denali. Sometimes it goes back to its memory position but not always. Occassionally the passenger mirror will reset to a different position too, but usualy it holds pretty good.
Made appointment for service, took it in. they said they had this big software update that might fix this issue and some other things like radio. That was probably 3 weeks ago. Have no idea what software update did, nothing changed that I can see.
Have another appointment on12/2 to meet with some tech about this issue.
Will post after that, but I'm worried it won't act up when I'm there.
