Ive used VMix for playback to a BMD 3g monitor. A couple times now when I test the playback the sync is fine but a few hours later when I play some thing, the audio is out of sync. I can correct it with the audio settings, but I'm not sure what exactly is causing it or how to prevent it. I'm using the external output at 1080i59.9. I could understand a little drift as the playback progresses, but I notice it shortly after restarting the playback.