Android 5.7.x. wakes up in different mode,error/failure

I start Android app 5.7.x.
I select an album to listen music.
I put aside the Android…
Meanwhile the Android goes to sleep/standby.
When Android wakes up (to choose another album/music) the last screen of Rose Connect is lost, the connection to the RS520 as well and a new screen appears like this…

It forces me to select a device

@Ben

Please check a few things.

  1. Does the same symptom appear even if you delete and reinstall your RoseConnect app?
  2. If you factory reset your RS520, will the same symptoms occur?
    RS520–>Settings–>System settings–>Factory reset

Hello ROSEHAN

1: I did that already.
2: I did that already for the installation of 5.7.x.
I have a fairly clean setup.

@Ben

Let me summarize your symptoms again.

Does this mean that if you leave your Nokia phone for a moment and turn it on again while the RoseConnect app is connected to RS520, not your Nokia, Nokia will be registered as a connected device in the RoseConnect app?

If the above is correct, please answer the questions below.

  1. When your RS520 is registered in the RoseConnect app and then changed to Nokia, does this symptom appear after you go to a place where your phone does not have Wi-Fi and the Wi-Fi is cut off?

  2. If this phenomenon occurs, please tell us the frequency.

  3. If you look at the photo you sent, RS520 is displayed in Connectable devices.
    If you select RS520 and then select Complete, will the device be connected again?

Hello ROSEHAN

1: the phone does not leave . This happens in the living room with WiFi active at all times.
3: It can be both, the Nokia and RS520 and they both connect or are connected.
4: Because of this i lose the previous music selection

That is to say it only happens sometimes not every time the phone goes into standby.