My Trimline Treadmill T-315.1: At startup, when I step on the tread, it pulls and hesitates. Once I get to a higher speed it stops hesitating eventually, but the first 5-10 minutes is all hesitation and pulling of the tread. Now, the last couple of days there is a chemical type of smell coming out of the motor case and yesterday it just stopped suddenly. Today it started right up again, but the smell is coming out and I still have the tread hesitations so I'm afraid to use it until I figure this out.