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I unplegged the speakers for the holiday, when I came back the group is not working anymore. They all work on their own, if I group them it works only the latest one was playing. 

Hi @Andrea Felici 

Welcome to the Sonos Community!

I recommend you unplug your router and Sonos units from power. After a minute, turn on the router and wait for WiFi to become available before turning on the Sonos units again. If you have a Sonos unit wired to the network, turn it on first and wait for a solid white light before turning on the others.

You may also want to experiment with different speakers in charge of the group (selected first) - usually, the speaker closest to the router is the best choice. If you have an ethernet-wired speaker, select this first and group the others to it.

I hope this helps.