We have had three Sonos products on one system but recently the Sonos One SL disappeared from the system for no apparent reason. We have tried to re-add it to the system by resetting the factory settings. The app says it recognizes the product and has added it to our system; it also says that the product may not appear initially and, if so, to un-plug the product then turn it back on again to complete set up. I have done that several times but the product is still not appearing on the system with the other products. I have also rebooted my wi-fi but that has made no difference.
What can I do?