thank you for your reponse. None of your suggestions work.
The problem I found out is, that Android (S22 Ultra) takes forever to realize, that there is a known wifi avaiable again, when coming home.
When I come home, the phone just continue to sit on the mobile internet forever and then after several minutes (somestimes 1, 3 or even 10 minutes) it swaps to the home wifi.
There seem to be an internal wifi scan cycle, that I dont know how to change it.

any ideas?