@flx68
Because you mentioned it, I'm sure you know what APIPA is.
APIPA is chosen when the Device (in this time it must be the Raspberry) didn't find a DHCP Server.

So is your Router switched On, is DHCP active in your Router and is the Raspberry always in range of your WLAN ?
Did you use 2,4 Ghz or 5 Ghz WLAN ?
What kind of WLAN-Router did you use ?
You live in Germany, so maybe it's a FritzBox ?

I think you know this, but to be sure, this is what the Recalbox-Wiki has to say about WLAN:
https://wiki.recalbox.com/en/tutorials/network/wifi/enable-wifi
and
https://wiki.recalbox.com/en/tutorials/network/wifi/wifi-country-code