Same problem here. Restart did not solve the problem.
Since last update (after the last "big" one, there came some "little" updates OTA) bluetooth sometimes turns off. Could not identify a certain pattern so far. Once it switched off while playing spotify over car-hifi. Sometimes it seems to switch off when it has lost connection to bluetooth-device. It is paired to mi-band all the time, but the phone seems to switch off bluetooth, when connection to device was lost by distance and for a longer time.
Very strange. I hope Sony will fix this by another update, cause it is more than inconvenient, when I can not rely on a active bluetooth-connection, whether while driving car or for getting notifications via smartband.
