What in the electrical is going on...

[Jack Peeples]

I have a 2014 GMC Sierra 2500HD. I have seen where others have had issues with their G218 and fixes. I'm having electrical issues but none are of the headlights and traction control. My rear windows won't roll down from any of the switches. My radio now turns on and off by itself giving me a grey screen and it won't stay on but a few seconds before turning itself back off. Then after a few seconds back on again. The parking assist says it's disabled, which I have never used. And today when I went to start my truck to head to work, something drained my battery. After getting a jump and making it to work, 40 min away, I shut my truck off and it started right back up. So I disconnected the positive cable in hopes after my 12 hour shift it has juice enough to start. I have checked all fuses and all seem to be good. Also, my auxiliary plug doesn't have power to it either. Any information is greatly appreciated. Thank you.