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Windows 10 update KB4505903 may be causing issues with Bluetooth audio. Check out this workaround fix until the problem is officially dealt with.
If you keep your Windows 10 PC updated, you might have noticed that Bluetooth audio hasn't been working properly since cumulative update KB4505903 was released in July. This bug affects PCs with internal speakers, and if you regularly play audio over an external Bluetooth speaker, it can be a real drag.
Full story from the WindowsCentral blog...