First of all: The SoundSwitch DMX Adapter sometimes needs a few tries of plugging it in and (re) starting the lighting service/daemon. That’s been the case since 2.x and I can’t remember that it ever was different.
Since updating to v3.1.1, the audio output is lagging/stuttering (like pressing pitchbend down, only about 4x as strong) sometimes when I remove and re-plug the SoundSwitch DMX Adapter.
Starting or stopping the lighting service does not cause the issue as far as I can tell. From what I can guess, it seems like some interrupt due to the hardware change is causing these problems.