Scotty Landreneau

I been having the same issue (without the clunk noise). I’m in a 2014 Chevy Silverado 5.3L as it was dead dead and I tried disconnecting the battery with both post at the same time. At that moment I realized the negative cable was slightly warm. The volt meter was reading 12.4 volts. Then after about 2 minutes it connected them back. My truck screen went on and then started up like normal. I then let it run for 10 minutes. Turned it off and on 3 times. I left for 5 hours and came back and it was dead dead again. So I repeated the process again and it started. May be a loose ground? Or some new security feature which protects the computer? If this continues I will check my ground. If it still continues I will bring it to the dealer.