Re: We are reviewing your Amazon.com seller account
The problem is in the security automated system on amazons end. They need to fix it otherwise they will continue to flag shops for no apparent reason. My belief is they are limiting the amount of sellers they want registered currently.
If you google the suspension/review email, and modify the settings to show last 30 days of history, you'll see countless people posting on the amazon discussion forums the same problem. Mind you these are people probably registering with their real information, so its not related to stealth accounts.