Dang, the thing is back to zero.
http://neo.jpl.nasa.gov/risk/2004mn4.html
I got a feeling this guy's been around for a long-long time, like +100,000,000 years, that's he's fallen into a long term 2/3 resonance with Venus. (Who hasn't?) Superimposed on the long-term resonance is an aperiodic perturbation due to the the effect of the Earth. In fact, a gravitational encounter with Earth may have been what caused him to be captured by Venus. (Like I said, happens to all of us.)
Of course, I'm not 100 million years old, yet, but the older I get, the harder I have to fight my graviational encounter with Earth.
This is little more than a hunch on my part, but what do I know, I'm just a hopeless romantic.