
Hey James, I've encountered the same issue, The problem stems from the power source.
The adapter that plugs into the back of the mixer jiggles from vibration and loud noises and causes the mixer to temporarily lose power, a quick flip of the phono line switch should turn the sound back on, but in order to stop the problem you'll have to tighten up where the power adapter connects to the mixer or send it to a technician who can. It's a fairly easy fix, and a major downfall of an otherwise fantastic little mixer.