Had a similar problem on my 16 LTZ. Problem occurs when I have multiple items plugged in (e.g., phone, ipod, ipad, and thumbdrive) at the same time. Often times the power to one or more of the outlets (USB and/or cig lighter) flashes on and off rapidly. Seems like they are not pushing enough juice to power all the outlets they have built into the truck. My screen will go blank and it won't recognize any media I have plugged in. Really frustrating.