There is plenty of evidence that a few large investors are playing this stock, and there have been many claims of hedge fund buying/selling on this board. If hedge funds are playing with this stock, the price swings could be the result of any number of stock strategies being exercised. The disconcerting aspect of this is these fund managers fly basically unmonitored. Couple that with large amounts of cash and a stock of this sort with average relatively low volumn, and you get a stock that is ripe for game playing. Large stock movements can pay huge with stock future (option) strategies.
This use to be the most wonderful, dull, boring income investment.. then a lot of traders arrived on the scene and the volitility and volume increased. Now the big guns have found that it is a good investment and have joined the party. The volitility and volume are again increasing substantially. I prefer the old days, but they are forever gone.