Bluetooth doesn't come back on after reboot

[ejstubbs]

Since upgrading to Android 6.0.1 I've noticed that Bluetooth doesn't come back on after I reboot the phone.  It always used to before the upgrade.

It's very inconvenient because I usually only realise that it's not working when I discover that the phone is not connected to my car's Bluetooth module, so I can't take incoming calls or make outgoing ones without pulling over.

I'd be very grateful for any advice as to how to fix this problem.

[ejstubbs]

Update on this problem: around the turn of the month it went away - bluetooth came back on after a restart just like it had always used to. No idea why, or what if anything caused the change. Most likely a app somewhere was my guess, since that's all that changes on the device these days. However, after a week or two the problem came back. Again, I'd changed nothing apart from allowing apps to update. In order to investigate the app hypothesis further, I tried restarting the phone in safe mode. No joy. Normal mode, bluetooth on; restart in safe mode: bluetooth doesn't come back on. Safe mode, bluetooth on; restart in safe mode: bluetooth doesn't come back on. So it looks like it's not an app after all. I have now found a workaround using the Smart Connect app to schedule a task which turns bluetooth on in the early hours of the morning. But it's annoying that I have to do this when the problem simply shouldn't be happening.