Problem with GCEmu

I have a huge problem with GCEmu.
After about 5 minutes the emulator suddenly shuts down for no reason.

Operating System:
Windows XP Home Edition SP2
CPU:
AMD Athlon XP 2500+
Video Card:
Sapphire Radeon 9600 Pro Atlantis
Sound Card:
C-Media AC97 Audio Device
Memory:
512MB DDR