You may be more of a treadmill expert than I am so pardon me for this answer if you have tried it. My treadmill is "stuttering" when I run on it so I have tried a little bit of everything. Have you adjusted the tension? Some say 2-3" for the belt when lifted, others say 3-4". This may be causing your problem. Step off the treadmill and then turn the adjustment knobsat the rear 1/4 turn each CLOCKWISE. It can pause when the belt is too loose. (Don't tighten too much because that can really mess it up.) Let it run on 2.5 - 3.5 for a while to adjust itself and then if it is still centered try again. Hope someone gives other answers, because I am at the end of my rope with mine.
Frustrated treadmill owner, September 2008
