The power off trick suggested by Jaime doesn't work for me however my
sansa has a slightly newer firmware (v01.01.32A), and my PC has a
slightly newer kernel on my hardy system (2.6.24-23-generic)

The "running lsusb a few times" trick works for me 95% of the time, only
100% (but awkward) fix I found was unloading ehci_hcd, device then
remounts at USB1 speeds, then reloading ehci_hcd module and it remounts
at USB2 speed with no problems.

However no fix is permenant, since ejecting, and unplugging, and then
plugging back in is not detected until lsusb etc.

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usb connect problems
https://bugs.launchpad.net/bugs/231049
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