cyber cx

Hi. have just put 6 Cyber Cx's in an ice rink and am having a couple of problems.
When all fixtures were installed they were re-lamped and happy. within a week they were playing up. we only ever have between 1 and 5 striking, 1 will strike and die straight away and a couple will die after a few min's. all DMX functions seem fine, the mirrors and steppers will happily carry on. there are 4 led battons on the rig as well which work perfectly on the same DMX run, i am suspicious that the power could occasionaly fluctuate as the desk will momentaraly dim once in a while, max temperature is around 7 degrees at the rig but these fixtures have worked there before on the same system.
Any ideas.:15:
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