Games ''freezing'' 0 fps 100% speed, sound still works

[Fenarth]

Whenever I play for more then 5 minutes on Dolphin SVN R 4965 and I play Super mario sunshine/Pikmin 2 the game freezes. My fps goes from a constant perfect 30 to 0 and the speed(100%) and sound remain unchanged. Then after 5 more minutes the emulator crashes =/

Any ideas?

On a side question the RT and LT buttons on my 360 controller dont work on the emulator. Any ideas?

[skid]

Are you running in Dual Core mode? That might fix it.