Bitstamp is working fine right now, so that's definitely not the reason the price is going down significantly.

I think it has more to do with the Chinese government trying to tighten down own exchanges as they allow people to move wealth from one country to another.

And as you know, China can't stand that. I wonder what the outcome will be. It seems that traders don't want to wait and thus start dumping massively. It's time for sub $800 prices.