I have a 2011 Yukon Denali, I have owned this suv since 2014. Was lease turn in. It has 186k on it but has always been taken care of and garage kept. About month ago I noticed that when I came to a complete stop it would shift in and out of gear twice. Just like clockwork at almost 100% of the time. Also it had a little bit of shudder at cruising speed.( between 40 to 60 mph). I took to local dealership and I was told they don’t know what it could be. The mechanic there said they don’t really work on them they just replace them with new ones. Oh yeah the price for replacement was 4400. It was not throwing any codes so he couldn’t really say. Such a waste of time. So in my research it seemed to be torque converter. So I had it replaced ($900). Shudder is gone now but still going in and out of gear at stops. So I ordered a new Tehcm ( Transmission control module) ($500). When latest repair was made the mechanic, (not dealership) said everything looked fine. But it still has the same problem just not as bad. I’m at a loss and need help. The local dealership is a joke here. Can someone help me diagnose this. If I had the money I would just replace but outside of the stopping issue trans works perfect.