if you can export a “logcat” from that timeframe it will very likely give a hint what’s the reason. In higher Android versions on-device logcat readers need an adb grant to work properly.
adb shell pm grant com.f0x1d.logfox android.permission.READ_LOGS
- https://f-droid.org/en/packages/com.f0x1d.logfox/
- go to filters and enter into the “package name” filter “
com.citymapper.app.release” - bottom menu bar, 3rd button “recordings” → start recording
- provoke error in app
- export / share recording log by selecting the option
Edit: created a screenshot walkthrough at [HOWTO] log app errors with LogFox on-device to create bugreports