X Spot Problems

Hi to anyone who may be able to offer some advice.Australia 240v 50 hrz Power 12 X spots in our inventory, will all run properly during prep at the workshop, tested hung and receiving DMX from a console. get them out on a job at certain venues, and there will always be some in the group that start to play up,not the same units I might add. Terminators are in place, good data cable, Only X Spot's on that Data Line, no other fixtures in the rig play up, ie Studio Commands, Studio Color 575, Studio Spot 250, get the X Spots back in the workshop and they are all fine again. Could it be Power, ie Switch mode power supply does not like over Voltage or something, I need a bit of help to figure this one out I think.

Regards J.P
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