Our lighting system has problems... flashing, loss of control... etc. I suspect its the cheap dimmer packs. Testing with a cable tester reveals that a line through the dimmer has good continuity until the power is turned on to the dimmer and then there is bleeding across pins. The mains ground is connected to the chassis of the dimmer box which I've read is a problem I think.

If my suspicions are true, what is good dimmer that will not have this problem we could purchase? Preferably low cost

Thanks