Nah, it has nothing to do with Bitstamp or any other western bitcoin exchange. Current decline and somewhat unstable situation is caused by Chinese government trying to curb bitcoin trading.
They continuously see Bitcoin as a danger to their own domestic financial market and fiat and way for Chinese citizens to transfer money abroad.
That is why they recently announced harsh AML/KYC procedures will take place on every major Chinese exchange from now on... There might be more anti-bitcoin laws coming.