This issue has been fixed by modifying system of SFU Server.
We apologize for any inconvenience this may cause.
If users mute/unmute their audio repeatedly, their audio stream could be delayed for about 1 second during a video/audio calling with SFURoom.
The audio delay is recovered if the users leave and rejoin the SFURoom.
We are fixing the issue and we could resolve it within the next month(Jan. 2021).
We'll let you know the update in this announce.
We are sorry in advance for any inconvenience.