Ooops, my wrong! I turned off the TV and the troublesome zone started palying the music. It must be some sort of priority between TV and Sonos. Thanks Fae, I see it as problem solved.

@Fae Thanks for your help. - I changed the Speed/Duplex of the Sonos Port from 100MF to 1000MF, - set the QoS mode as 802.1P Based (I see no possibilty to set the Priorit que, it seems to belong to...

Hi, I have an older Sonos system with 4 zones. One Sones device (Connect) died and I changed it for a Sonos port. It is connected via an ethernet cable to a TL-SG108E switch which is connected to the...