Just gotta keep trying. I hd to do it 3 times with that sprint razr today but it eventually went through.
i'm a little superstitious too so there was a little ritual I did before the last time I flashed it and it was successful. I turned the phone on ad let it get to the main screen even though you can't do anything. then I took the battery out and put it back in and put it in bootloader mode.
also I closed everyother program on my computer except multiflashflex until it finished flashing
hope this helps
good luck.