gilshultz hinted "terminating resistors" in post#3.
Could be the only thing needed to make things reliable.
Leo..
Before adding RC filters, try a simple series resistor in each line, such as us used in WS2812B data lines.
No, I have not. But that would be an easy thing to test.
I'm not in a hurry on this project. Still got 4-5 months before it should be completed.
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