Right now people are squaring their portfolios to make the best of maximizing their tax loss positions. A lot of these stocks will regain value after Jan 1st (unless the markets in general fall). I hold two or three stocks which are under similar downward pressure.

I really wouldn't worry too much about these anomolies. If you have researched your stock and good news is flowing then just hold tight, or take advantage of the tax benefits and buy back in the new year.