I've been dealing with this problem for a few days now...on a USB port that has been worknig for years.

I just moved it to a different USB port on the same computer (equivalent of moving from front to back, though all 6 are on back) - and that was it.

I've tried a bunch of other things - rebooting - putting into diagnostics mode - throwing it at the wall...

Anyway - thannnnks.