On my Qu16 I’ve noticed recently that when I place some effects on vocals using FX1 or FX2, they seem fine in a sound check and then after a couple tunes the effects diminish greatly. Adjusting the fader doesn’t help at all, effects only project slightly, then all of sudden a few minutes later they come back without doing anything. We did a gig last Saturday night and everything was great in sound check and our singer really liked the amount of effects on his voice. We played a few songs in sound check and all of sudden he turned to me and said the effects are gone, and no one touched a thing. I slid the fader up and that was the best I could get although overall it was very slight. We started the show and part way thru the first song the effects came back with a vengeance and since we do our own sound I could not adjust it down until the song ended (I’m the drummer and run sound) Any ideas from anyone on what could be going on??