I have been through two powerbot's (both refurbished). My second one has been going strong for about 3 months, but it has now started getting really loud. It is kind of like a rattling noise. Not as pronounced when the vaccum is on carpet, as it is on hardwoods. I am guessing that it is coming from one of the small pivoting wheels under the center of it, but I can't say for sure. I have cleaned it thoroughly, and it doesn't seem to be coming from any blockage around the brush. Has anyone else experienced this? Does anyone have instructions on how to daignose where it is coming from, or service it yourself?
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