I didn't have an USB problems with the K2, so I can't say if the KDX attached to such a port works any better or worse.
I did have the KDX reboot itself when I unplugged it from the USB and then quickly plugged it back in when I realized I still wanted to use it. I think I just caught it when it was coming out of USB mode and crashed it. I don't recall the K2 ever doing that.
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