I can confirm this, as I'm the one Dave refers to. Started P3D, then vPilot. Did a full flight without issues. Kept P3D and vPilot running, but disconnected and reconnected with a different callsign. At first, everything was fine as I was able to listen to the frequency. After asking for my clearance, the problem started. I heard nothing, the controller sent me the clearance via text and I read it back via voice, which he able to hear because Dave told me the controller said "readback correct", which I couldn't hear.
I then restarted vPilot and reconnected. From there, everything was back