I think here are mixed up two things.
- General problem using Osmand+ or Swiss ZVV
- Disappearing of network connection using wifi.
Regarding 1st point: I’m using Osmand~ and have no problems at all. The “~” means, that I got the app from fdroid app store.
Regarding 2nd point: I have the same problem. If I move out of WiFi coverage and I get back inside WiFi coverage the Android apps are unable to establish a connection. In this case restarting Android App supports or switching wifi off and on again helps.
I’m using 4.2.0.21 on XA2 single sim.