I have been using two Elation Design Spot 250s with an ETC express 250. My problem is they "freak out" every so often. When they freak out the lights move up or down stage (generally) flash the light then go back to their focus point. Has any one had a problem like this or know how to fix this. I run the dmx to them Through a ETX DMX node- two port then change the 5 pin dmx to 3 pin dmx. I am using data cable not mic cable to run the 3 pin to the lights and I also have a dmx terminator in the last fixture in the chain. I think these things are just crap but I am hopping there is some solution to this problem. Any suggestions would be appreciated and i will keep you updated on the progress.