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Running vanilla 3.2.29 (Slackware 14.0). I also had this issue on 2.6.37.6 and *possibly* 2.6.33.x, but I don't recall.
Every now and again (could be every few days, could take a couple of weeks...
depends.) USB 2.0 stops working. My scanner as well as certain mass-storage
devices that are USB-2.0 compatible fail to function all of a sudden.
With the said mass storage devices, I get lots of errors like this in my logs:
hub 1-0:1.0: unable to enumerate USB device on port 3