This problem persists through all games and I have tested FRAPS which fixed the problem, making Action the only likely suspect.
After recording I put the files in for editing and I find that around the halfpoint mark of each file the audio, both game and microphone are gone. But when I open the raw file on VLC it is all there...
I use Windows 8 on Desktop with a resolution of 1920x1080. I have emailed support but wanted to see if anyone here could help!