I'm having this same issue. All other parts of the game run fine but it ran great for 4 days and now it has started doing this. It's a game breaker for me. I would say the lights at Obsidian are burning far into the night trying to fix all the bugs. This is not a detrimental criticism as I'm so pleased an organisation had the stones and support to make what appears to be a classic. I'll come back after the game has matured a little more.
Jon