Game switches between 60 and 30 fps

[Jim]

I'm recording the game with Fraps for YouTube, and occasionalaly it'll drop down from 60 frames to 30 for a few seconds before springing back up to 60. I have an FPS meter on the Fraps app for my G13, and it's always locked at either 60 or 30. (I mean, it's usually 60; the 30 fps bursts only last about 10 seconds, and occur once every ~20 minutes.)

I'm done recording for the night, (giving my nerves a rest), but I had an idea for tomorrow. I capture with 30fps in Fraps, so I'll try it at 60 and see if that stops the issue. Kind of hoping that's not the issuethough. Capturing at 60 fps would bloat the file sizes a lot, and there's no sense in that if YouTube is only 24 fps.

Does anyone know what could be causing it?