Treadmill is running faster than it should

We purchased a Sunny Health & Fitness treadmill (http://www.amazon.com/Sunny-Health-Fitness-SF-T4400-Treadmill/dp/B00OS9R9VW/ref=sr_1_1?ie=UTF8&qid=1460911592&sr=8-1&keywords=sunny+treadmill) about six months ago. We use it for 20 minutes daily, 6 days a week. I lube the belt once every three months. It works great, overall. I use the same speeds every day (usually between 3.5 and 7.5 mph).

Today I get on it, and I have to jog at 3 mph. It still increments like it should, and speed is maintained at each interval. Seems fine, sounds fine, but the speeds are way off. My gut feeling is there is a disconnect somewhere between the computer and the motor. I've looked everywhere online and haven't seen this problem. Can any veterans out there help out?

Thank you in advance,

Ryan

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