Cyberlight data issue

Sometimes when you think you've seen it all this gets thrown at you.
I have 3 cyberlights with dmx daisied togeather with the first line coming out of a splitter. We turned them on and as we did a dimmer check everything worked fine. A few minutes later i noticed the intensity of those 3 cybers was at 0%. Guessing a data cable got damaged i sent a guy up with a new one. He replaced it and all 3 snapped back on, but before my guy could get half way down they went out again. I had him pull out the in and out dmx lines and plug them togeather to bypass the fixture but still nothing. I had to get another line and go strait to the 2nd fixture so i would atleast heve 2 out of 3. Some how the cyber is burning out the dmx coming in but not damaging the out. Any ideas?
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