Reply to audio 2 dj, x1, vci 100....

at last evening 's gig i had a few HUGEE problems...
first my vci 100 crashed and it was like it's turned of....
then my x1 was not responding
lately the whole sound was gone but traktor was working and tracks were playing ....
after that i reboot the pc...
i played all evening without controlers....
and it crushed again....
i'm using dell inspiron n5030 T4500 @ Dualcore 2.30 Ghz with 4GB ram + usb hub with power supply....
and the most worse....i was using my pc with 2 GB ram and traktor pro 2, it was doing this thing....i added extra 2 gb ram and working with tp1 and still doing this thing...
what could be the problem....
thanks