[villagetinker]

OP, If you can get manuals for the device (parts, repair, etc.) I could take a look at it. If you are luck, this might be a lubrication issue. The one we had specified the use of spray silicone lubrication between the belt and the floor. Many of these use DC motors which have brushes, could be a brush problem. If the problem is in the electronics, you may need to locate spare parts. In any case there is time involved, so as noted above, it maybe cheaper to just get a new one. I can take a look, but would like to have more info, send mea PM to discuss further.