i think you are right. My right speaker was not connected completely. It's one of those banana plug speakers where the knob screws on and the screw was loosened somehow.

Seems like either one of your connections is loose or you need to email Sonos. I've never experienced that problem.

I'ved owned my Sono Amp (latest one) for about a few months now and ive noticed once in a while when I play audio, one of the channels (i forget if its consistently the left or the right) doesn't play straight away. I am not sure if consistently its been when I use airplay or spotify connect or what but its happened a couple times. Anyone notice this?

Sonos AMP: Sometimes one channel not playing audio