Hi there,
Yes I have had a similar problem where if the video drops out (Switching cameras) but the recorder is still on to record audio, then the audio gets delayed by the amount of time the screen has been blank. In some recordings it can amount to entire minutes of audio being ahead of the video 🙁
This is on SDI, compressed/uncompressed, HD and SD resolutions, using the mini converter/audio muxer and direct to the hyperdeck also.
Have tried everything, no real solution for it yet 🙁