Thank you for your quick reply. Below is my reply to your questions.
1. Is M9 too far away from XQ-50PRO? When using LDAC, the transmission distance will be much shorter – very near, only about 2m or less. Tried again now and they are beside each other and problem still occurs.
2. Does M9 have any power-saving mode and other automatic stop playback? – all power saving options are turned off
If none of them, you can try to ignore XQ-50 on M9 and reconnect – I have tried turning off both the M9 and XQ-50 then reconnected but problem still persist.
– Tried to “forget device” from M9 and reconnected and problem still occurs