Don't be panic because of the drop. At 30.66 AGNC is still a buy.
If you read one of Seeking Alpha articles, the company's liability is less than that shown in the previous quarter. That is not a bad news. In a couple weeks, its price will be back to $33 or $34 soon. Watch.
I bought at 31. My goal was for the price to remain constant and to reap a great dividend. If it doesn't appreciate, who cares? Even if the dividend is cut 25% it sure beats MMF's. So in this market, it's a good buy even if you're not betting on appreciation. BUT, you need to be comfortable that it won't tank.