I have just been on with customer support as I am now unable to play music simultaneously in two separate rooms (only since downloading the recent update!) Prior to this update they have worked fine in both rooms since purchase of the second Player1 in November. Apparently, as I have a wifi booster near one speaker, it is now reading it as a separate 'network' and I cannot play music simultaneously in two rooms. Before I go out and purchase the suggested Sonos Booster, I would like to check if anyone else has had this problem. I am not a technical wizard but this doesn't really make sense to me as they worked perfectly before and nothing has changed in my environment.