I have a tx 5.o treadmill. I only used mine 3 times. My son ran on it one time. The next day i got on after 7 seconds it stops. The plastic wheel that goes between the sensor was cracked. Had it replaced and its doing the same thing. How can i fix this problem? At this point, if you know someone that repaired yours for a reasonable cost let me know. Thanks

Tracie, January 2010