This may or not be a Sony Vegas issue, but any suggestions would be appreciated. Every once is a while my AVCHD footage has a small audio glitch, but only when i put two simultaneous files together. The audio at the end of file 1 goes silent (straight line on the audio track) and sometimes I can also see a missing frame from the video track. It does not happen all the time, but it is very hard to trim - which is what I've had to do a few time.

Camera: Sony PXW-X70
Software: Sony Vegas Pro 13
Format: AVCHD 1920 x 1080 60i (29fps)

Thanks!!