Hi Everyone

I am new to this site, I have just bought a 08 grand prix GXP with the v8, love it, it runs great the power is great and the cylinder cut out is nice when you are on a road trip. I do have one problem when the brakes get wet and the car is parked the brakes “rust” or stick to the rotors. If you let the car set for a day or two they really stick bad, you have to put the car in gear and step on the gas to get the brakes to break free, then they are fine.
Any ideas on this? Is this a recall? The dealer just blew me off and told me its normal.
This can not be normal, thanks for the help.
V8 Loving GXP owner