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MegaBar DMX sync problem

Hope someone can help, I've got 7 MegaBars along with some Chauvet effects.  I'm running a ShowExpress 512 interface (I'll get to ADJ stuff shortly).  When I run a pattern it starts in sync then slowly falls out of sync over a short time.  IE, all lights flash the same for a couple flashes then some bars get slower and slower.  The patterns the same, the speed changes.  I can't figure out why all the bars can't stay in sync with preset patterns.  Setup, created a 9 channel profile, can do static color with no issue, DMX control of each fixture is fine, not a configuration issue and I've tried 2 entirely different sets of cables, both DMX (not instrument) cable.  I have each fixture set to DMX address, don't want to slave off one because I want to control each separately also.  Is this normal?  I'd be so grateful for any ideas, these lights are awesome, so much better than any other light bar, I'd hate not to get them working correctly.  If there's any chance ADJ DMX equipment would fix this I'd spend the money but sending a DMX signal down a line is pretty simple, I can't imagine it's the interface.  Please let me know if you have any idea or need any additional information, thanks so much.

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