Also try a standard non dimming switch. Should give an indication if there's a general wiring fault.
What kind of general wiring fault could cause these symptoms?
Sorry rushing responses. I should have said wiring faults/issues can generally a bitch to identify.
I'm in the middle of looking at wiring problems in a non domestic installation.
Funky neutral/ground setups and nails through wires have been common issues I've seen for circuit issues.
@Airhead started
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Also try a standard non dimming switch. Should give an indication if there's a general wiring fault.