Fortunately, account suspensions on Amazon are rare but they do happen and they are a seller's worst nightmare. Suspensions are normally the result of a serious complaint (such as counterfeit or inauthentic products) or a series of performance notifications.
Here are my top quick tips for protecting your account health:
Suspension is scary but it's less common than it seems and it IS possible to get reinstated without spending thousands of dollars on reinstatement services.
If you DO receive a suspension notice, take a deep breath. Don't rush to reply.
Your email contact with Amazon should be professional, short and to the point (use bulletpoints), It really only needs two parts:
Be polite, businesslike and unemotional. Don't ever get confrontational or aggressive and don't try to pin the blame on anyone else (your supplier, your mail carrier etc.) Amazon are only interested in your processes.
You may only get one chance to appeal so again, find an experienced and trusted seller (or several if possible) to read it through before you send it. Good luck!