CorOS Version: 3.0.0 & 3.0.1
Describe your issue:
Ever since CorOs 3.0.0 came out I almost always had very bad static noise issues.
I extensively tested my QC with different cables, power supplies, different wall sockets, guitars and cables and tried to fix it with the ground lift on input 1. I also compared it to other gear like the HX stomp on the otherwise exact same setup. No issues there.
A few days ago I accidentally used the ground lift on input 2, which is not connected to anything. Then went back to input 1 and the noise was gone. Today I was able to recreate this once.
So the ground lifts on input 1 and/or 2 seem to be bugged.