Computer won't play any online video until I reboot
Solution 1:
RESOLVED I had the same issue. Put the Win10 to sleep. After waking up UTube or online videos did not play. I could browse in the timeline in the Utube video and showed up the thumbprint of the xy second of the video but did not play it. I tryed the restarting from task "Audiosrv" and AudioEndpointBuilder" but did not make any difference. But from "Services" i restarted the "Windows Audio" service that resolved the issue without browser restart.
Search "Services" in your "search", which is next to Start button in Win10. Open up the application, find "Windows Audio", right click on it, use "restart" and that's it. Should work :)
Solution 2:
Solved mine on Windows 10 by doing this: In Task Manager go to the services and restart services with name; Audiosrv AudioEndpointBuilder