We've all seen the card inside the box from the manufacturer that emphatically recommends that if you have problems with their product, "DO NOT RETURN TO STORE". If you actually follow that advice, you will likely endure several minutes on hold with a product customer service rep who will ultimately avail you with the contact information for a service center for repair.
Posting to this--and other--forums is bogus and fruitless. My policy--and my recommendation--is return any unit that does not perform as expected to a store that sells that model and exchange it for a new product. If the store balks at exchanging the unit, purchase a new one, switch out the new unit for the old and repackage it, then return it to the store.
This method works, and results in a functional device with the minimal amount of wasted time.