FCPX Multicam Audio Fade Issue
 

I've recorded video on two separate cameras (Nikon D800 via Atomos Ninja & a Sony HDR-AX2000) and FCPX' s multicam sync puts them together nicely. However, after about 10 minutes, the audio tracks fall out of alignment and there's quite visible sync issues between the clips.

Here's the audio info for each camera:

http://i.imgur.com/8GJZV.png

http://i.imgur.com/hfEyY.png

Is there anything I can do to fix this so I can pick one audio track and have it match with both video clips?