If someone had told me 20 years ago that trucks of the future would have dome lights that come on by themselves for no apparent reason then keep going on and off every few seconds for days without end, irrespective of the switch, I wouldn't have believed them. It's amazing how far we've come!
I drove a T680 that did similar. Spray around the seat base at the floor with static guard and it stopped it. Don't ask me why, I have no clue, just that it worked.