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I registered some very good Chinese related domain names many years ago. I was getting tons of traffic from China, and suddenly the traffic dropped off a cliff. I don't know for sure, but presume they were blocked by the Chinese authorities. I didn't (and don't) have any pornographic or otherwise contraversial content, so I don't know why they were blocked.
Anyone have suggestions? Thanks in advance.
They also have Real-Time Testing of Internet Filtering in China [cyber.law.harvard.edu] where you can ask them to check whether your site is being filtered. I haven't tried this as none of my Chinese sites have been banned in China, but this might be something that interests you.