So, a first thing happend to me yesterday while on gig.
The first LED on the channels lid up, and I didnt have any music playing on those channels. (only the first LED)
Channel 1 - no music loaded. (1 Green LED) Channel 2 - music playing in my headphones Channel 3 - music playing on the dancefloor Channel 4 - no music loaded. (1 Green LED)
And the same occured on the other channels when the music was paused.
Some times the LED turned off, but came back on again from time to time. (only one LED)
And yes, it was properly grounded…