App cannot connect to server when running in the background.
If the app runs in the background and I activate it again, it sometimes happens that the app can no longer connect to the server. (yellow connection sign) This happens quite often, but not always. (Usually after running longer in the background.) This problem is not reproducible yet. When the app is closed and restarted, the connection works immediately.
Device: Huawei P10 Plus, Android 8 Time stampes: 16.3: 9:47am; 10:45am; 19:38 pm 17.3: 8:29 am
These are only examples, problem could be observed already more often.
Couldn't test this with iOS yet.