I purchased a SC Live 4 for work and the mic channels don’t work properly. There is an audible delay as if there is repeat in the chain somewhere. I never got to the bottom of it and just had to use a Sure radio mic. Shame as I tried for weeks. It had a factory reset and firmware updates. It could be faulty but it’s on a cruise ship and purchased during a drydock on the other side of the world. That’s not going back! I’m not sure what fault could inject a doubled up copy of the microphone back into the system but it happened!
I also had the well documented issue of button lights not coming on every five-or-so boots.