XTR PLUS Frame rate issue. Drops from 24FPS to 20FPS. Seeking advice

[Hunter Zimny]

Recently I've been having an odd specific problem with my AATON XTR Plus.

 

For some reason lately I lose 24FPS crystal sync and my camera will periodically drop to 20FPS. It happens erratically with no clear reason. I've caught the issue in the eyepiece, cut and re roll then the LCD will go back to displaying 24FPS

 

It's happened in a variety of situations, using both voltage regulated gold mount adapters and the original 12v AATON batts. I'm fairly convinced it is not a power issue. The FPS speed dial on the camera is locked firmly at 24. 

 

Has anyone had this issue with their AATON?

 

Here's a video showing the issue.

https://www.youtube.com/watch?v=Q16IpTVHACo

 

Any advice or opinions would be greatly appreciated

Thanks