Honestly, sounds like a vid driver issue. i still run driver version 296.10, because it's the most stable Nvid driver for my card. try downgrading a few versions, and see what happens.
Started a new map, villagers keep disappearing...
5 MK3 energy collectors and a MK3 Anti-Matter relay, puts out about a diamonds worth of EMC (8000+) every 30 seconds that goes into 1 energy condenser.