G A 4 Strange Mute problem

I’m fairly sure this is a operator problem but can’t seem to figure out where the problem lies.
I open GA load kit…see MIDI signal coming in and no sound. Click on a pad , nothing.
Go to mixer in Cubase no signal on GA Buss

I explored and found that somehow the GA Mixer Kit was muted. Unmute everything is fine…for a few minutes then no sound, I go back and it is muted. I have checked the more obvious…QC…bypassed no datat on any controller lane…which wouldn’t effect the plug in anyway.

Help !!!

Thanks

Terry