I've had my truck 3 months/3,000 miles. It did it starting day 3 of ownership and has got worse. It is always during the first start up of the day heading to work, no xm. Go out for lunch and works fine. Frustrating. It might be a gm software issue.
Mine has been doing the same thing. Frustrating driving to work in the morning without xm. This is a great tip, hopefully they release a software update. Now I have 2 things to do when I start up my silverado in the morning.....1. turn off auto start, 2.turn off xm app. LOL!