This could be because the belt on the motor that turns the belt you walk on is worn out. it has grooves on this belt that must be prominant to stay in the groves on the front roller and motor. The motor belt can be ordered for about 20$ shipped on ebay the motor belt number is 118016 this is a universal belt and fits this treadmil. Before buying the replacement belt check to see if this is for sure your problem. you can tell by opening the front of your treadmill and looking at the belt. You will see worn spots on the motor belt, or as I noticed when mine went bad, it will look like someone threw a bunch of rubber eracer shavings in your treadmill.
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