Good evening

.
I got Sh4 1.5 not too long ago, I've noticed it quite often causes my nVidia 8800 GTS 320mb PCI-E graphics card to crash, The nVidia drivers will reset the video card and the game goes back to playing for a second, then crashes again and this loops forever until I reboot.
I'm using the latest drivers for the video card from the nVidia site, this didn't happen to me before I got u-boat missions.
Any ideas on how to squash this one?