I've had this problem since I got my new laptop.
Sometimes (relatively often) when something happens in the discord, e.g. I mute or turn off the speakers or someone joins my channel, I hear a sound as if my sound is hanging up, and all of a sudden the sound is gone in any of the currently open programs. Must then restart each program (also discord). It's so NERVIG just in while I play games. I uninstalled it a few times, restarts my PC and even wrote to the support.
Now use a developer version of Discord, but again it does not work.
I NEED URGENT Help. AM ON THE edge of despair!
Try the "stable" version
Oops, you used that