SUMMING UP FOR ALL USERS:
0) Update you device to the latest firmware and perform a factory reset after that
1) Disable battery optimization for every bluetooth service as
- Bluetooth MIDI service
- BT Tool
- Bluetooth sharing
and for every app that will need to use bluetooth to transmit data as
- Phone services
- Call management
- Phone/Messaging storage
- your music player
- other telephone dialer apps and so on.
Thank you Admin. I am on 20171227 and it works for me.
Think about Reset app preferences.
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