I experienced this problem on sunny afternoons with my 2007 Satrun AURA XE and the chrome surround bezel around the trans shifter. I basically would keep my hand in that area or place an object in that spot; I guess you could carry some tape with you if you like. That's the downside of a dressier interior! I didn't have a sunroof in the AURA and it was still a problem. Let us know what you come up with to solve this problem. Also, maybe contact GM and your dealer so they are aware of the issue - if you have it, I'm sure others will too. They might not be helpful to you now, but maybe a part change will come out of this and something you can benefit from later.