Thanks for posting your questions.
Sadly the more experienced readers of Ujals excellent site would require a bit more detail before being able to help you.
Could you begin by posting the manufacturers name and model type of the dimmer in question.
Also, I would encourage you to read the technical explanation of the DMX lighting protocol listed elsewhere on this site.
In a large number of cases that wiring or termination errors are the cause of the sort of intermittent problems you have mentioned.
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