My Sonos Connect can't connect via WLAN to the bridge

Hello all,

previously I used my Sonos setup (a Connect, a Play:3 and a Play:5) on my wired network without using a Sonos bridge. Anyway I decided to buy one in order to be able to use the Play:3 and Play:5 wireless and also to test if I can get rid of the STP issues I have with the Play:5

Play:5 and Play:3 connect perfectly to the Bridge and it seems my problem with the Play:5 is gone.
Unfortunately there is an even bigger problem now. I cannot connect the Sonos Connect to the bridge, anyway if the bridge is 2 m away or one floor higher. All trys to connect it wireless did not work. If I used the wired connection it is immediately available. Already tried factory reset without effect.

I wonder if the WLAN of the Connect device is even working?

I have attached a hardcopy of my network matrix in following link

http://www.marquardt-treffen.de/bild...nos/sonos2.jpg

I'm also wondering, why the Play:5 is marked yellow and stats an STP state blocking. I thought that would not happen if the device is connected via the Sonos WLAN?

Basically I could use the Play:3 and Play:5 wireless and the Connect wired but I would like to know what's wrong with the Connect.