I've been experiencing this issue over the past months, it comes and goes. About 50% of my Skype calls using Skype for Linux Preview are ok, the other 50% aren't. The audio is pretty much broken: in pavucontrol, Skype flashes rapidly as a playback device, and you can hear in this video what that does to the call:
This is regardless of whether I use my laptop's built-in audio hardware (mic and speakers), the Microsoft LifeChat 3000 USB headset, or an analogue mic connected on my desktop PC with audio going to my home theater receiever through HDMI.
Has anybody else experienced this? Are you aware of a solution or workaround?
Skype version 188.8.131.52042
Calling version 2017.21.01.23
(EDIT: I also tried submitting this as a bug using the "Report a Problem" option, but the bot seemed confused by what I was trying to say. Does anybody know if Microsoft saves our feedback in bug reports and whether we can somehow follow up on what they're doing with them?)