Sorry if this has been asked before, but I couldnt find anything. I have a NNBS 2008 GMC Sierra. My truck was having issues with starting last week. Long story short, I changed the abttery with a duralast from AutoZone on Friday. Truck had been starting fine ever since. Then yesterday at lunch time, I start my truck, and the radio is completely off. No Clock,no radio, no signal chimes, nothing. Idrive to the bank, get back into the truck, start it up and eveything is working fine, except the clock and date was reset. Now eveytime I start up the truck, the radio clock and date are reset, even after I set them. Any ideas on what this issue can be?