I have same problem, happens maybe 1/10 times. Audio never syncs up, then it is very hard to sync up in video editor as you can't just drag them to the same size. Very annoying. Some files the video also does not show. Some files the audio does not play.
Here is a video of my issues. I'm noticing now that the audio is trying to speed up to catch up with the video. Never noticed that before, it usually just lagged behind:
same problem happening for everyone i hope that they are not ignoring as because i only bought action software yesterday and i had fraps before and only because it old and no one update it from so long .
I have solved the issue! If you open up ACTION, look for video framerate and turn it down to about 20-25. I've tested this myself and it fixes the problem! Might require further testing just to be sure but I do believe that is the issue. Hope this helps! :3