You need more volume? There is only a float of 54 M shares, which means that every 20 trading days, the entire float has changed hands. Off course that's not the case, for there are many of us holding for a longer period of time. Makes you think, doens't it?
As long as there is this kind of volatility, shorts will not cover. Shorts need weeks like the prior one, for covering.
As long as there is this kind of volatilty, you can expect anything.