Unknown risk of what they will do with the $1B from patent sale. They said they will return it to stockholders so there is risk of a big dividend or stock repurchase, which has kept short interest from increasing recently.
Still riding the momentum of the $1B Microsoft deal announced last month, not to mention the $250 million stock buyback they announced August last year. other than that, I can't explain it. This company is trading at valuations worthy of Apple-like growth. And they are not growing. I am not buying it.
Matter of fact, I have taken a small short position at 27, and will hold onto it and perhaps add more to my position until sanity returns to this stock.
I know you were aware of the above already, but I honestly don't think there is more going on. Just my simple take on it. Good luck whatever your position:)
Disclosure: short 2K @ 27 initiated today. Also holding 27 strike September puts.