Hi. I have 4 Sonos speakers connected wirelessly, i have the hub and 4 BT discs and all are usually stable. I use an iPhone to run the Sonos app on.
What upsets the apple cart is when i leave the house taking the iPhone out of wi-fi range. When i return I then often cannot see the speakers in the Sonos app BUT in MyBT all are connected to the hub as is the phone. Rebooting the offending speakers is then the only option.
I have noted that if i have my TP Tapo wifi plugs near the speakers the Sonos speakers also struggle to connect - they need ~18".
The software update doesn't seem to have made this any better/worse. Tim