I looked in my dmesg logging and found:

[ 8803.200000] usb 2-2: USB disconnect, address 2
[ 8807.200000] ohci_hcd 0000:00:13.0: IRQ INTR_SF lossage
[ 8807.200000] ohci_hcd 0000:00:13.0: leak ed c1898040 (#81) state 0 (has tds)

This brought me to bug #84762 on 
https://bugs.launchpad.net/ubuntu/+source/linux-source-2.6.20/+bug/84762.
Not that is provides a solution, but these bugs look related. 

Roel

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USB stops working on Toshiba m45-s165
https://bugs.launchpad.net/bugs/43305
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