I restarted the game from scratch and rented a room in RIVET CITY as before. I needed to rent it only once for the entire game I just finished. However, when I go back to this time it indicates it's "locked - hard" just as if I hadn't rented it. Well, the 1st time I've re-rented it assuming there was a glitch as I didn't recall seeing the caps taken. The 2nd time was a real annoyance but I had some stuff stashed in there and had to get to it. The 3rd time was experimental as I was checking what triggered the reset. Seems that it is reset by the amount of time away from the room, not just RIVET City. When I WAIT, or fast travel a short distance and come back within a 24 to 48 hr period does not trigger the reset. Anything over 48 hrs does reset the room.