Do you know why it's going down right now?
Dumping by the people who have been mining at low difficulties, followed by panic selling. Because of the recent difficulty coaster exploitation, a lot of pernicious miners entered the network hoping to make large profits mining only every other adjustment period. Their selling is depressing the price, but also decreasing the likelihood of them continuing this difficulty exploit in the future. What we're seeing is a normal price adjustment as far as I am concerned. In fact, I'm surprised it took this long.