Had a firmware update tonight for my TV set. Once it was over, my Sonos had an ‘echo’ effect. After investigating for several minutes, I was finally able to figure out that the firmware update for the TV had changed the settings for the TV’s speakers from ‘Off’ to ‘Auto’. Once I turned the TV’s speakers back off, everything was back to normal.
In the past, before the release of S2, I’d had Western Digital change my SMB settings on my network drive, also without giving me any notification.
Just to warn everyone…not everything that is audio related is necessarily Sonos related.