I think the long weekend in the US has caused an elongated weekend dip which in turn has shaken the confidence of the market. People sell out thinking it's a crash which drives prices down lower. The upcoming difficulty hike in just over a day is probably contributing too, with miners thinking about cashing out and selling up.
I expect to see it hit around seven or eight dollars before before prices start to rise again, but there's nothing to stop it from going lower than that. This is only really a problem if you're not in BItcoin for the long haul, I guess.