What exactly are you talking about. I see us down $0.01 for the day. I see us down 0.30 since the 18th. Thats less then 1%. Not sure if thats something to worry about as that happens about once a week.
Lots of supply came to the market this week that widened the spread between treasuries and junk bonds. Seems some junk buyers are having some trouble with the current record low returns and have backed away a bit. We've seen this story before; I wouldn't get nervous yet - especially since underlying treasuries continue to strengthen (ie, interest rates on the 10 year is trending lower).
PS - While I absolutely hate junk bonds for the long haul in the short term they're probably OK.