Hello. I have the same problem like you describe, but mine it is a little bit different. I am using the browser to watch a video and lets say that i also play a computer game that uses my microphone and headphones. at some point in time, it stutters but what i have noticed, is that when i open sound control panel, the speakers (where i have my high definition audio device enabled as playback) is blinking for 2-3 seconds, and then i get an message in the middle of the screen that my sound device is now the default device. I will post a printscreen with the error if needed. Have you guys figured out what is going on? i've tried everything, reinstalling drivers, reinstalling windows, reinstalling antivirus, hence i am using bitdefender, looked online for this issue, and noone lese has it, made the whole list of suggestions that the moderator said. nothing works. it is from windows, i am pretty sure of it and it has to do with something that triggers it... either an update or something else.
and to finalize how it manifests after the stutter, it makes all my applications that were using sound silent (everything is on mute) and i have to restart all programs in order to have sound again.
this is really annoying for me.