I know this is an old thread, but I just recently had similar problems as described here. First warning sign was Windows showing a message that a USB device had failed. Checked over everything and couldn't find any problems. That happened about a week ago.
Then yesterday, Traktor started locking up my entire computer. A complete freeze and I couldn't do anything except do a hard reset. This happened several times in a row so I came here to look for answers. I did a back up (I already had a backup, but it was about a week or two old) and have switched external drives. I'll see if that fixes the problem.
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