I have the latest i7 with 32gb ram and find the sliders sluggish or refuse to stay put going back to 0, drives me nuts moving them requires several tries sometimes, I checked CPU usage while do this and there is no increase in usage to write home about. My wireless logitech mouse has the latest drivers and works fine in Photoshop and other applications. Win 8.1
I just tried that and the issue is still there, I move the slide just slightly to the right and it flicks back to 0 making me do it all over again.
There was a bug with sliders on the Mac fixed by a LR release a few months ago, but I'm not aware of other reports of these symptoms on Windows.
Try resetting LR's preferences: Resetting the lightroom preferences file - updated - Lightroom Forums. Sprinkling that magic fairy dust fixes a surprising number of problems in the user interface.