Minecraft Not Responding

I was playing fine for 2 days. As of this morning any time I get deep, like in a dungeon zone etc my game just freezes and I have to control alt delete to close. When I log back in it freezes again either as soon as I load that game or shortly after loading.

I can create a new game and be fine as long as I don't start digging or go deep it looks like. I was fine being deep until this morning. It does not appear to be a CPU or Memory issue. I keep console running but it does not even generate a report when it freezes and goes dead.

So Far I have:
Updated Graphics Drivers
Tried dropping all graphic settings
Re-installed Java
Re-installed Minecraft
Opened up computer and removed any dust in case of overheating