de0u
r134a
thank you,
i did not have another wlan network to try, so i tried the "guest" network of my router,
and i dont know how but this somehow fixed the issue (in both networks) (i turned guest network on in the router, so i guess this somehow reset/ changed something for the router idk)
(it is 2,4 ghz and i only "reconnected" in the router, but not like completly rebooted it, probably should have done that aswell)
so i guess it is some problem of this router