Mine is doing the same thing, did you ever get it resolved? How?
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what worked for me
I emailed customer service about this problem and received a prompt reply which solved the issue for me. www.workoutwarehouse.com
I had to press stop and speed up while inserting the magnetic key to enter "calibration mode" then scroll through that mode to re-calibrate the incline. After I did that my treadmill is working normally again.