I am experiencing a really strange error when playing any video (downloaded video or streaming e.g. netflix, youtube). 

I connect headphones to my laptop via a wireless USB dongle. When playing video with the headphones connected, the video and audio works perfectly. However, when i disconnect the USB dongle, and try to play video, it doesnt play at all. A video will load if I select one, say on Netflix, but it just wont play at all. Then when i reconnect the headset via the USB dongle, the video will start playing again. 

I have tried restarting my laptop with the USB dongle disconnected, and this doesnt resolve the issue. I have even uninstalled the headset drivers to try and remove any history of the headset being connected to my laptop, and the video still wont play at all. 

It feels like a really strange bug, any help on how i can fix this would be appreciated as I want to be able to watch video without having to connect my headset. 

Thanks