Freezing/fps drop after 5/10 min of playing

Minecraft ALONE starts freezing after some time

What I expected to happen was...:
Not freeze

What actually happened was...:
Freezes

Steps to Reproduce:
1. Play 5-10 minutes lag free with constant 60 fps
2. Pull hair out with freezes lasting 10-15 seconds a piece with NO framerate and then works for a second or two and freezes again, only restarting fixes it temporarily
Its a new alienware m18x, with dual 765m's, I can triple box games like EVE with no issues. nothing else freezes with minecraft, cpu usage stays at like 4-5% memory usage stays low as well, minecraft states its only using 10%ish of the 1gb of ram...

Let me know what other information would be helpful and I will be sure to include it