Parented Camera randomly warping about

Ladies, gentlemen.

I've figured out a decent camera set up based on an example given by one Testure.

The setup consists of a main camera that's parented to a GameObject that copies the target player's position. I've also made it so that when a certain key is pressed, the camera rotates behind the player. That's not exactly working right, but that's for another question.

Anyway, the issue that I'm experiencing is, whenever I'm moving about, the camera will randomly, just, warp somewhere. Note that the GameObject it's parented to doesn't move at all, just the child camera.

So yeah, what on earth?