Random Output Issues with Faders on FB-4 and Nano-4

Experiencing 2 different random output issues on 2 different desks with 2 unrelated show files. Both are using v 3.0.1 software.

On Full Boar 4, sporadically when the Grand Master is brought down to >5% (usually 0% or 1%) the output stays at 0-1% even when the Grand Master is brought back up. Only when the master is brought down to 0% a second time does the output level release and the Grand Master regains control of the output. Very random.

On Nano Hog 4 PC, when Fader 1 is brought to 0%, somethings the output stop at 10% and randomly flicker or fade up and down until the fader is brought up again, then the problem disappears.

Wondering if this is physical fader issues (dirty/faulty faders) or a strange SW glitch)

Thanks for your help

Travis Slyter
Ruehling & Associates, Inc.