2020 1500 here, started doing this a month ago. We have had the battery tested many times, it was at the dealership for 10 days, and they had no issues with it starting, but one time. They said they suggest a new starter, but can't guarantee that will fix the problem. We picked the truck up on TThurs afternoon, I drove it to work Friday morning, to home fri afternoon and to run an errand, it sat for about 1.5 hours, husband went to start it and it wouldn't start. We do know the battery is draining while sitting, but we're told that the truck should be able to start with the battery voltage at 11 or 12, which it will not start at, bur there have been no answers from the dealership at all. Very disappointed right now, as we have a truck for more than half the month has not been available for us to drive with no answers from the dealership. Also wanted to mention, we were using the remote start, but stopped after we finally got it back