KienSub not automatically recognized as soundsystem over Bluetooth after 1st connection

Hello Kien Team,

When connecting the KienSub stereo with my Windows 10 computer over Bluetooth:

• The first connection, it works and shows status "Connected (Music)".

• However, if I disconnect and reconnect (or simply restart my computer), the KienSub stereo is showing as "Connected" on the Bluetooth settings but does not appear as a sound system.

• To solve the issue, I have to delete the KienSub from Bluetooth devices and add it back.
  It then is identified again as a sound system.

Details of the config:

• OS: Windows 10 Family 1903 - 64 bits
• PC: HP Spectre