Exercise Equipment Repair Questions? Ask a Technician
If the belt is sticking then adding some lubricating oil under it might help.
You can use belt lubricating oil - http://www.amazon.com/100%25-Silicone-Treadmill-Belt-Lubricant/dp/B00TOYAJ7C
The oil should go underneath the belt - deposit a long line and allow the belt to run on its own without walking on it to let the oil take effect.
Let me know if there is any improvement.