When you have a quality treadmill that is in high use , eventually maintenance will need be done. Common things that might need to be replaced on your treadmill is the belt or motor.
When this problem comes up you will need to find a certified technician in your area . Also check with your manufacturer to see if your product is still under warranty .
What to look for with a bad belt:
-excessive noise and loss of grip
-the belt will fell slippery and lose its functionality
-loss of traction
What to look for with a bad motor:
-slows down when walked on
-power on panel display lights can dim
- the motor just completely turns off
So take the proper steps and maintain your treadmill so you can get the best use out of it.
Michael - The Gym Doctor