Fraps lags Minecraft after about 2 minutes?

So I've been recording Minecraft videos for about a month, just recording Sky Wars games to see if I can catch any good plays. But about 2 days ago, after about 2 minutes of recording my FPS drops to about 5-10. After I stop recording it goes back up to 50.

If you go into fraps and lock the frame rate at 30fps it should prevent it from dropping. It's a common occurrence in Fraps.