I have other settlements that are being problematic and it usually boils down to electrical equipment, and even more with clamped electrical items such as connectors or conduits. . It is tied to the lights dimming/going out in the settlement, that is lights that previously were powered are no longer powered. (passive radius lighting) How to fix I have no clue but here is how I have been getting around the issue. Save often. Especially if you make progress without crashing. Get the Portal Gun mod and set up a portal between build site and someplace just outside of settlement boundaries. If using the Place Everywhere mod, disable storing of clamped objects. Pick up the lights and portal them outside boundary area and place on ground When you have them all out you can use the console and the disable command to get rid of them. Disabling storing of clamped items will usually allow the scrapping of object such as a wall that the item is attached to but by doing it in this manner I can go ahead and make most changes.