I use a one and sl either side of bed , and alarm function is useful
I have same problem as I've seen many others ...ie right channel frequently dropping off pairing (L+? Appears in settings)
Nothing wrong with my network.
"Find missing speaker" function is useless.
I noticed it reconnects if missing right channel speaker is power cycled briefly. So I've connected a smart plug and set timer to turn off for 1 minute and then back On just a few minutes before the sonos alarm function activates.
Obviously I shouldn't have had to, but until they fix the bug this workaround works for me.
Thought I'd share the "REPAIR".