Not sure tbh, never come across that one on eq
But it sounds like your system could be overclocked?, if running a new gaming pc it might be
I would check the bios to see if it is, might be the issue
only thing i can think of
Red
In the past I've had odd issues with mice that has hardware accelleration build into them (steelseries sensi) - If you are using a very fancy mouse, for testing purposes, try and pop in a 5 dollar simple usb/ps2 mice, see if that makes any difference.