When the system volume is low and/or the player volume is low, Bluetooth speakers tend to auto mute because they receive low frequency sounds.
Fix 1
- Use the physical buttons of the Bluetooth speaker device to lower the volume
- Set volume of the system and the player to 100%
- This way, the Bluetooth speaker device will receive high frequency sounds most of the time.
Fix 2
- Play any of the "Low frequency" audio files with a media player and set the player volume to 50% (may be enough or not)
- The audio file "Low frequency _ Steel Mill.mp3" at 100% volume is almost inaudible and works fine.
- Enable repeat\loop in the player
- This will prevent the speaker to auto mute because it is always receiving the minimum sound frequency it can play.
- "Low frequency" audio files are almost inaudible (only at high volumes they may be audible)
Download 3 Low Frequency Audio files:
https://www.mediafire.com/file/3hx7n7f0bx4jzg6/3_Low_Frequency_Audio_Files.rar/file