Parallels desktop audio record latency will increase, slowly, over time. This is been an issue that I have encountered over many years of using the software. I'm not sure if it is related to clock drift, or what.
A relatively easy "fix" is to disable the microphone in the audio control panel, and then reenable it. Unfortunately, if you do this while Dragon is listening, it will cause Dragon to freeze up in a pretty bad way, so you must do the following:
- Turn off the microphone in Dragon
- Disable the microphone in the audio control panel recording pane
- Reenable the microphone in the audio control panel recording pane
- Turn the microphone on in Dragon again
In my configuration, I have the key ctrl-` bound to turn on/turnoff the microphone in Dragon. Also, in the audio control panel recording pane, I only have one device, so the offsets in this auto hot key script work. You may need to tweak it, for your own use. Hopefully, it gives you a starting point.