Keep in mind that treadmills are large appliances and really should be on dedicated, non-switched, non-GFI circuits (without anything else on the same line). It is highly improbable that this is the main cause of the problem. I hate to be the harbinger of bad news :( but Horizon is not exactly top notch. Aside from that, unlike TVs and Microwaves today that can take a good punch, fitness equipment in general are very susceptible to things like power surges, low/high voltage and brown outs. You should keep it unplugged when not in use. Assuming its not power related worn or faulty parts may cause excessive strain on the electronics. There are several possibilities, the most likely being a worn out running belt and deck.
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