I'm playing Skyrim on XB1 and I've been having a few problems with NPCs freezing and not moving anywhere. So far it's been Irileth and some guards stopping about halfway down the road to the Western Watchtower (I fixed this by reloading and walking alongside them instead of rushing up ahead) some guards in Whiterun and now Hadvar in Riverwood won't move.

I've tried reloading an earlier save, but the trouble is I don't know how long he's been stuck there. Every save I load up, I fast travel to Riverwood and he's still in the same spot. I'm also worried I will have this problem later with more important NPCs so it would be good to fix it early.

I have a lot of mods installed but I've loaded them very carefully and I can't think of any that might be causing it since it's not in specific places, it seems random. I had one that altered the Western Watchtower, a few that alter Whiterun but none that alter Riverwood.

Any help would be appreciated.