I have been using Multiplicity for a very long time, and paid for the upgrade to 4 in order to continue to support your work. I obviously have a multi-system / multi-screen setup, and use one of my older boxes for email / chat / slack / discord etc, but also to listen to audio books or stream music while I work. Since upgrading to 4, the audio will 'cut out' at very odd intervals without a given pattern. In order to 'fix' the issue I will click the Multiplicity Audio icon in the system tray to 'disable' streaming audio, then click it again to 'enable' streaming audio and everything is fine. This issue did not occur with my '3' version, as it ran for many years on many systems without problems.