Vicki, may be your house is just really clean :-) Anyhow, here is a little [http://homesupport.irobot.com/app/answers/detail/a_id/132/~/roomba%E2%AE-is-not-picking-up-dirt-as-well-as-it-used-to|blurp that] might be of interest. Not sure if you cleaned the brushes already. The [http://choisirsonaspirateur.info/wp-content/uploads/2010/03/Roomba-500-Series-Service-Manual.pdf|Service Manual] for your Roomba just in case you need to make further repairs. Good Luck.