My phone has the same issue, reboot fixed it for about a day. Then I tried unpairing repairing, worked until I turned off my device it was connected to, then I tried resetting the bluetooth midi app in the application settings, force stop, clear data, power cycle phone, fixed it once, now I can't reset the app again. the option is greyed out. Happens in my car and on my bluetooth headset, box won't check. Running OS 6.0.1, car is a 2014 Chevrolet Cruze. Still haven't found a permanent fix. I don't really want to do an fdr if I can avoid it.