I think there was one other who recently had a similar issue. Unfortunately there is a bug with the audio error reporting in MixEmergency 1.7.2 - so I can't use the log file to diagnose the errors. I would try changing the format that you're recording to in MixEmergency (from Apple Lossless to Wave) and making sure that you record to your internal hard-drive, and then seeing if the issue persists.