Have you applied any lubricant to the belt recently?
If not, then it may be creating friction when you step onto it and that will overload the motor, causing it to shut off.
If applying belt lubricant does not help, then check the condition of the underside surface of the belt - if it is badly worn or frayed then it will need to be replaced.
You can use any silicone lubricant, e.g. http://www.amazon.com/100%25-Silicone-Treadmill-Lubricant-Application/dp/B0153WN84E
Yes, if the belt is not lubricated then the friction will cause it to burn.
Let me know if I can be of any further assistance?
Hi, just checking in on your question. How did things turn out for you?