These apps only work right when all is spot on and well. There are now so many reasons that I no longer can list them all. I will share the top 3 I run into so you can start.
1. Torrents. Either on your PC or others.
2. Windows 10 sharing updates (yours or other PCs.)
3. Other malware or infections.
Recently whenever I use any sort of voice calling service, such as Skype or Teamspeak, after five to eight minutes into the call all sound coming from my computer will cut out and those that I'm in a call with say they can't hear me. I can fix this by simply restarting my computer or turning off then turning on the audio service, but this isn't practical when I have to do this every five to eight minutes.