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Sounds like the voltage is spiking during the live supply switch to UPS when you have an outage which is confusing either the mix rack or the brain. You may want to try running editor on a laptop and trying it without a surface to make sure its a brain problem not a surface problem. Also probably metering the voltage you are getting from the UPS during switch over with a dummy load. Lights work quite nicely for this as you can see any drop/flicker. Hope that helps

Just remember kids no matter how good your mixing is you can’t polish a turd…