Refrain from any SONOS factory resets without further consult. How did you restore your network?

Good advice from @buzz. Question…are your patio speakers powered by a Sonos Amp or are they just regular Sonos speakers like a Sonos One or something similar? In any event if you start a music steam and adjust the volume via the Sonos app do you see two volume bars? If so your speaker are grouped and need to be ungrouped.  That would resolve the issue.

Thanks for such a valuable and mind-blowing sharing.