When Amazon suspends a seller account, an email is sent to the address on file as well as the suspension message appearing in the Performance notifications section on Seller Central.
If you cannot determine the cause from reading the message, I recommend posting it here to see if someone can give you a more clear answer.
Popular reasons for suspension are
1) linked to another selling account
do you or anyone in your household or anyone that have ever use your computer, have an Amazon Seller Account, or have been suspended from Amazon seller account?
2) listing forbidden products or listing gated products in the wrong category to get around gating
prohibited weapons or parts
listing a restricted item in Everything Else or as Collectible or in the wrong catgory
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