hilgert
Excessive Minimalist
Have had one of the units go offline once though and had to "re-detect" them with the controller. I hope that doesn't continue to be an issue.
What firmware version are you on? They just released v2.22 with some Hydra fixes (not specified what they fixed). Note that when you install the update, the controller may ask if you want to update Hydra firmware as well (pretty cool actually).
How many lights to you have on your 90?