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... Doesn't happen on every fixture......
this part of your statement stood out to me like a big red flag.
If it doesn't happen on every fixture, how is it a wiring issue ? (other than factory miswiring that is). Send the faulty units back, complete, or threaten the manufacturer to repair themselves in place. We had a lighting manufacturer pay us to repair their faulty factory miswired fixtures on a box store a few years back.