Sq5 intermittent muting

Hi we have a sq5 with latest software update recently (2weeks) ago
It will now randomly mute a channel without warning
Is it worth reinstalling the software ?

Wrong section!
You posted in the AHM section.

I have moved this to the SQ Troubleshooting section.

Is that always a particular channel? Could be something inside the pushbutton that shorts the contacts pads. I had this on the master fader a while ago.