HI, I found this thread and I have exactly the same problem : the sustainiac is not working anymore, no matter the pickup height, battery, or settings. It worked nice before, but after a changing strings and cleaning Floyd Rose, it did not work since then...
I would add that only the neck pickup is working, the bridge remains silent, even with the pickup switch in bridge position, we only hear the neck pickup.
Did you have an answer about your problem ?