schweezy

I have a 2014 Silverado 1500. Twice this week I have been walking up to my truck and the buttons on the key fob don’t work at all. When I open the truck manually and put the key in the ignition everything is black. No power at all anywhere. First time I thought it was just dead and needed a jump. With jumper cables hooked up I turned the key and it was all black for a second, then everything clicked on and it fired right up. Figured the problem was solved. Hooked it up to a trickle charger when I got home just to be safe. About 4 days later I got home after driving the truck home from work and went back out to move the truck maybe 5 minutes after shutting it off. Same thing. All black on the dash, no power at all. Turned the ignition on and off a couple times and after leaving it in the on position for a couple seconds a little bit of life flickered into the dash and then it started right up. I have checked all grounds, they are snug and clean. I am worried I will end up stranded somewhere unless I can figure out what the root cause of this is. Any help will be much appreciated!