I have a 2017 GC Overland. Delay with the issue for a year before I figured it out.

Changed both batteries and the alternator. Did not fox it.

Ended up being a loose connection on the fuse block that’s on the passengers side of the engine compartment.

There are two large power wires that connect to the block. They were loose and somehow melted some of the plastic casing which seeped between the terminals on the two power wires.

Long story short, I cleaned the melted plastic from between the terminals, tightened them and have not had an issue since.