flickering problem with 20k dimmer

I have 8 20k dimmers and one is flickering very badly. I made sure the line was terminated and also tried it's own line off the opti. After reading some here I also added a dummy fixture patched into address 512 then even soft reset the DP2000. Does anyone have any suggestions? by the way, I also did swap the dimmer with one that was working fine on another light and got the same problem.
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