Authentication is unstable in Wi-fi with captive portal #767
Description
When using the client in a Wi-fi which requires a login (or some kind of confirmation), the client seems to loose its authentication after some time.
Especially in public networks with flaky connection (no internet connection from time to time, suddenly log in required, i.e. all traffic is redirected to a captive portal) this is quite common.
In some constellation the client thinks it needs to re-login and stops trying to sync. This is very inconvenient. The client should never ever ever lose its authentication (only if the legitimate server replies with 401), but retry every few minutes until it reaches the correct server again.
When I am with more stable network, I can try to reproduce this issue in an isolated way.