I have two Play:1 speakers connected to my iPad. My iPad asked me to update my system so I have, however now only 1 speaker works? When I plug in the speaker that doesn't work on it's own I get a message that says "The software on this device is outdated. To keep the music playing, update the operating system or use a different device from Sonos". But gives me no option to update? I think one speaker updated but the other didn't. Both speakers are identical, bought at the same time. Is someone able to help? Thanks!