Guild Wars 2

So i have just built me a very nice new pc just so i can play Guild Wars 2.
Well i installed it and all, i was playing it then it just like froze, minimized and re opened like 4 times then closed, then my computer locks up basically. Just runs EXTREMELY slow like 2 minute delay time, and i have to restart it for it to work properly again. Any idea what this is?
Btw while in game i run a steady 60 fps on highest settings….

Specs:
GIGABYTE GA-990FXA-UD5 AM3+ AMD 990FX SATA 6Gb/s USB 3.0 ATX AMD Motherboard

AMD FX-8350 FX-Series Eight-Core Processor Edition, Black AM3 FD8350FRHKBOX

Xion High Performance 1000 Watt ATX Power Supply XON-1000P14F

Corsair Vengeance 16GB (2×8GB) DDR3 1600 MHz (PC3 12800) Desktop Memory (CMZ16GX3M2A1600C10)

and two crossfire nvidia 550 ti’s

I have now tried playing other games, My computer runs skyrim fine doesnt ever lock up. Seems like when i play Guild Wars 2 and Diablo 3 it does this. But when i play league of legends nothing it runs fine…..Anyone got any ideas? im so stumped on this…