I've always found that a restart worked when things like the bluetooth dongle stopped working. For some reason you get other programs that get caught up and cause errors that stop other programs from working. Normally a restart of your computer will fix it. If not than just unplug and replug in your bluetooth dongle and or uninstall it and re-install it. That usually helps.
I get errors all the time if I don't disconnect it the right way before I close the BT link. It normally just takes a restart to get it back working right again.
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