Having the EXACT same issue with my 2023 AT4 3.0. with 30,000 miles.
The "transmission" specialist relayed it was #1 & #4 solenoids sticking..."common problem". The Service Manager relayed there were none available in the US, factory backordered. Apologetic added, I have no idea when we will get them could be 2 weeks, 2 months or 10 months.
Is there a class action suit on lemon law protection? My fear is, they fix these then 2 more fault in 6mos and so on.
I went with the diesel for long term use with limited issues.