Response to I have this model. It is four years old. It no longer moves forward, but it does periodically change direction. I checked everything in the troubleshooting checklist. Everything checks out OK. I also replaced the front tires. It looks like the small gear on the driveshaft is not engaging the internal gear on the large wheel (that is, it is slipping). Could this be the result of wear? Is four years a reasonable lifetime, or should I expect longer?

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