economy - Why are so many financial big shots resigning?

Today I noted two new victims. Wang Guoliang, chairman of the third-largest insurer China Pacific Insurance Group, handed in his resignation, the official news agency Xinha reported. Fu Jianhua, the chairman of the Pudong Development Bank replaced its old chairman, Reuters wrote.
Earlier the president of the Bank of Communication resigned and the China Construction Bank got a new chief.
I'm not a big believer in conspiracy theories, but there seems to be a major reshuffle - and those are mostly done by the financial regulators, since the financial institutions are in majority state-owned.