My Mic has started to play up again this last few weeks. Well into the gig it starts producing sounds like gunfire and when I mute the mic channel it goes away. I have changed the lead and the problem still pursists. It never happens at the start of the gig, always a few hours later, just wondering is it anything to do with condensation as my mouth actually does be touching on the top of the mic when i am singing. This has never happened before, only since it has come back from Neumann after the generously repaired the last fault of cutting out.