Further progress/notes:
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it was not only Brave but also other Android Apps, e.g. Threema which didn’t have network connection through Wifi
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I continued with the normal (Sailfish) browser. After maybe an hour the online connection stopped and instead of the desired webpage a network login page appeared where I had to enter my phone number and then got an sms with access code. It worked again afterwards
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Brave didn’t work right away. But after stopping the Android emulator and restarting Brave I had again network connection through Wlan with Brave. Thus all well again (for now;)
My interpretation is that on the Android side the Wifi connection expired earlier than on the Sailfish side. But there was no possibility to regain/reactivate the Wifi connection from Android (emulated) apps. – Should this be reported as a bug and/or problem?