Entire Sonos disconnecting!!!!

WiFi unfortunately is not so good in your household on the Sonos-Net channel 11.
You can change this wifi channel in the advanced settings, i would like to know if channel 1 or 6 gives a better performance for you in your household.
You also wish to remove your SEBER-CIFT wifi from the Sonos system since you are using Sonos wifi created by the Sonos Bridge which is hardwired.
Since you are from Belgium and this is a forum for the Benelux, we can continue in Dutch if this is easier.

I did change the channel to 1 but the Seber-Cift WiFi is not connected to my Sonos system. I’ve always had it this way and worked perfectly. I think since I downloaded the newest app upgrade this happpened. I think there is a bug because as I can see I’m not the only one who has this problem.

Sonos has the information to connect to SEBER-CIFT but it wont since you have a wired Bridge. But as a precaution my coworker suggested that you remove that setting. If you haven't I would advice you to follow his guide.

Updating the app on your phone won't really change how your Sonos works, your phone is just a remote, basically. Post another diag after the music dropped and we can look what the cause for that was.

How do I remove the setting of the Wifi from Seber-Cift??

I tried on channel 1 and was able to play 3-4 songs then got disconnected again and after 10-15 seconds it jumped to another song which played from the middle of the song. Here is my diagnostic number 288023007.

Your confirmation number is: 1582641187
Now only played half of a song!!!
This is soooo frustrating!!
I have equipment worth thousands of euros but can’t enjoy.

Your confirmation number is: 1158964451
This time in the middle of the song the same song restarts again. It ends then about 1 minute later with the 2nd song it cuts of completely