I have 4 Sonos One SL speakers in my house. For the previous 11 months, everything has worked great. Starting last month we can only see all the speakers on my android phone and the app on my Imac. My wife is not able to see or control any of the speakers on her android phone. We have uninstalled the app and reinstalled the app on her phone. I have unplugged and restarted all of the speakers.