Hmm I'd take it to dealer and have them make sure the brakes aren't bleeding out by chance.
On another note, you may just not have properly bed-in your brakes (or burnishing) since it is a new vehicle.. yes brakes even need a proper brake in.
For more info check here on how to Bed-in brakes: http://www.essexparts.com/learning-c...rs/post/Bed-in
This should solve the problem about 90% of the time.
Current Modifications: Your average Bolt-ons & Suspension Upgrades
GForce Engineering: 9" Rear End, Strange Pro Iron Case w/Moser Nodular 3.70:1 Detroit locker, 3.5" Solid Drive Shaft