many sites on our network are under constant attack by Chinese IPs. i've seen several different types of attacks - password cracking, click jacking, and even straight up ddos. we get millions of rogue hits per day.
this is the world we are living in. you need to get on a host that can handle it. you're probably being penalized in one of many ways for the Chinese hits.
in your situation, your domain may have been blacklisted at the affiliate or google because of the Chinese hits. one thing i saw a client do was redirect all Chinese traffic to google. then he wondered why his PR dropped.
you have to either block that traffic or offload it (not to google). we actually block all of China, but their telecoms issue new IPs every week. i'd have a chat with your host. they might be able to plug in a network-level firewall cheap. everyone is freaking out about ddos these days.
good luck!
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