Arcing base on Revolutions

I have recently been dealing with a really annoying arcing issue between my lamp base and my fixture bases in my revolutions.

In the last month I have gone through half a dozen new fixture bases, and the problem continues.

I am perpelexed as to the cause of this, havent really changed anything in the programming or the rig that could attribute to this problem.  Anyone ever had this issue caused by a bad run of lamps? 

I have a dozen revolutions in the rig, but I am having this issue with only 3 of the fixtures.

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