Connection issues on Windows 10

Ahh, yes - so Bluetooth is basically just a Serial class, and has all of its methods, like write: http://www.espruino.com/Reference#l_Seri­al_write

And yes it just outputs over Bluetooth NUS.

If you were using setServices/updateServices that should be fine - but it sounded like you might have been using updateServices to write to the NUS RX characteristic? If so, that could have caused some problems.

About the "N08R7" in advertising - do you have any idea how that might have got there? Do you use setAdvertising in your code? It seems very odd that the advertising itself would change all by itself.