Random NPC's just 'freezing'

[ChancellorKremlin]

Is anyone else getting this?

 

I've got it with Doc Mitchell in Goodsprings once, and Dixon in Freeside at least 3 times.

 

They are walking about doing whatever, and then suddenly just 'stop' and stay motionless as if dead, but they are not dead. Talking to them has no response, but starting combat does. I've 'killed' them through the console and then resurrected them and that seems to sort out the problem.

 

I am asking here because I don't know which plugin could possibly be causing this, I've updated nearly all the Sexout ones in the past few days.