I have a 2012 LTZ with navigation system. On occasion, when starting the vehicle I get an error message that the SD card is not inserted. I cannot clear this message by reinserting the SD card and the navigation system is not available. I can only get the navigation system to come on if I park the vehicle, turn it off, and wait about 15 minutes. Upon reentering the vehicle it starts the nav system as if there is no problem. Has anyone else experienced this problem?