The problem is as if the mixer needs a warm up period before it will put through sound.
the amount of “dead air” time seems to vary from 2 - 10 minutes
i have reinstalled the latest firmware again but the issue persists. The mixer is as new and has been used only a few times never left the house with under 3 hours of use approimatley
the action happens in the video @ 7:20 - and in this example it took the mixer about 8 minutes to function, intesting after this period the mixer seems to work fine even when its switched off. But in the morning its back to square one.
I would get it changed mate; that’s not normal at all.
Also in the meantime, I noticed in the video you reset the decks too, you don’t need to do that, don’t risk corrupting your drive plugged in to the deck(s); resetting the mixer alone should be fine.
Hope you get it sorted out quickly and painlessly.