Sporadically do not receive messages

Sorry to add to this thread

I have one Android device 7.1 Another Android device 9. Both of them have Jami running under two different accounts. Both devices have Jami running in background. Battery optimisation allows background activity for Jami on both devices.

Both devices have PUSH notification disabled.

DHT enabled, TURN and SIP Enabled, local peer discovery enabled, UPnP enabled.

Initially both devices A (7.1) and B (Android 9) can exchange messages - no issue.

After 5 or 10 minutes when A tries to send a message to B - the message never gets delivered.

At the same time when B sends a message to A - it gets delivered.

This is happening consistently with the device B which runs Android 9 version - I have checked it multiple times, Jami is allowed to maintain background activity.

The only way for B to receive messages from A is by making Jami on device B go offline in the accounts tab and come back online.

The issue seems to be so far affecting only this particular device B running Android 9. This is very similar to the original posters problem. Can the OP let me know the Android version of the two devices.