When I put my Ones in surround pairing with my Playbase, the right surround speaker has started crackling. It seems to mainly happen when playing audio from my ATV 4K, which plays through my LG C8, which is in turn connected via optical to the Playbase.
When I was using Play: 1s instead, it didn’t seem to have these issues. Have tried switching Sonos Net channels, but nothing seems to help. Have also tried pairing / unpairing the surrounds.