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Over the last couple of flights I've been getting a reasonably small, but significant oscillation of my yaw when no stick input is provided. It yaws for about a second in either direction. If I input a slight amount of yaw using the stick, it will stop it, but it will return when I release the stick.

What could cause this? It's the wavy lines... Log is also attached.

And zoomed in on the first section:

2012-06-01 09-45 225.log