I have a 2012 Silverado 2500HD, recently it has started doing this. Normally when you turn the switch off the power to the radio, power windows continue for a period of time. Recently it has started loosing all power when the switch is turned off and when I start it back the radio, the climate control are back at a default setting.
It also has started occasionally doing nothing when I turn the key to start it. I can try it a couple of times and it usually starts like normal. Once when it didn't start I noticed a message on the message display about Security system. Not sure if the two issues are connected but they both started about the same time.
Any advice or thoughts are appreciated

Thanks