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After very light use 15 minutes a day for only a couple weeks, it started making an intermittent clacking sound.
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It is a LOUD clicking/clacking sound, not a rocking vibration (that is a separate sound we are also hearing), but a cyclical sound that has pauses between noises.
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Additionally, the unit has developed a creak or a squeak-- not all the time, and I can't figure out why, but as weight shifts on it, it lets out a pretty annoying deep creaking sound
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Each time it made a horrible sound, felt very awkward to walk on, & smelled like burnt rubber
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If I lower the speed to 2 mph, I can have a normal phone conversation without the other person hearing a weird humming sound in the background.**INCLINE
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My only complaint is that it makes a terrible sound when you're on the treadmill and turns it on.
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As another reviewer pointed out the speed adjustments speed up for a few seconds when slowing down which can make you trip or startle u since it jerks you into an unexpected speed.