Has anyone experienced this? All went well with my HD500 for 3.5 hours but after a 2 hours break, no sound came out of it. The sound came back again after I switch over to another patch and back. It has happened so often I can just duplicate this "error" again, anytime. The HD500 is left powered on stage through out the 6/7 hours of use.

My HD500 is going direct to the PA and I am certain all my settings are pretty much normal with my Volume before everything else.