I have a soft modded Xbox with XBMC (among other things of course.) I hacked a controller cable and a usb extension cable to add a usb port. When using my flash drive with XBMC, the drive randomly (and intermittently) disappears before the video will play. Once the video starts playing, it usually keeps working. I originally had a usb port hooked to the cut up cable, but suspected that was the problem. No change since going to the extension cord. Other items, such as my usb keyboard, do not give any trouble.
Anybody have similar issues?
My electrical and soldering skills are above average (and I have redone it three times!) so I do not believe it is a poor connection or short in my wiring job. I have also continuity tested while looking at pinouts and found no problems.