Ok, of course you have to know that.
Under “only when away” I would not have suspected 10 minutes.
This meant that I was actually always online. I use the addon “Update Scanner” in Firefox. And since I currently scan the German page every 5 minutes, I was actually always online for the system.
I turned on “always” and it works. 
Thanks
Uwe
(Translated into English with DeepL)
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