Hey guys, just randomly WoW has started to stutter! i dont get why? when i meet the requirements for this game easy and im running on "low" video settings, can someone please help? i have restarted WoW and my PC and it is still happening!

PC Spec:
Windows® 7 Home Premium 64bit
Intel® Core™ i5 Processor 760 (2.80GHz, 8MB)
1TB Sata Hard Drive
ATI Radeon™ HD 5450 1GB DDR3 graphics
6144MB Dual Channel DDR3 [3x2048]

Thankyou
Pulser