Not exactly what you had happen but... 2019 Ram 1500 Hemi. My truck wouldn't start 4 different times. Very random but all in the morning. Replaced 3 year old original battery myself and it still did it again. Wouldn't start from fob or button. I can't find anything that causes it. Looks like low voltage around 11.6-11.7 at battery. Starts after jumping. Dealer can't find any issues. Picking it up today after 4 days at dealer and of course it won't happen there.
When you have this happen and see 11.6V at the battery, how are you testing this? With a meter at the battery? If so, does it remain at 11.6V if you disconnect the battery and test again?
If you have low voltage at the battery while it's connected, then you should disconnect it to test it separately to make sure nothing on the truck is draining down the voltage. If it's only happening when connected (which seems likely as it's reoccuring) then you may have a short somewhere.
Losing a few volts isn't a big deal with a fresh 14+ volt battery. Will still be enough to start most things needed on the truck, but a constant short could slowly drain the battery down and eventually you're battery has a new float point. So a short in an alternator winding could allow the alternator to still work, but produce less voltage output. Because it's not fully dead it may be missed, but something like that could cause problems and not be found until you replace it completely. A turn to turn short on the alternator wouldn't pop a fuse, or cause the alternator to completely stop working, it'll just be a strain on the system.
Could be anything electrical though, but not many other electrical items could cause that. Unless there is some voltage regulation board that's failing, and causing voltage setpoint to be lower than it needs.
But i'd start with testing the battery connected and disconnected to see what's going on.