As in title - when I load a save and advance a day, my mercenary company disbands on its own without me doing anything. It's happened on multiple occasions, but this instance is particularly annoying as they were in the middle of a siege. Looks to be sufficient manpower and good morale so I don't think it's those. I've tried reloading (like 50 times) and it always happens, without fail, at this save point. But not always at other save points.
Am I missing something?