You sold on Amazon products that actually are not available in your stock
For some reasons you shipped ordered goods to your client later than promised according to Amazon policy.
You did not use trademark or copyright in the right way in order to sell your products on Amazon as a result your account was suspended
You don’t have rights on particular intellectual property you sell. You didn’t know this product or any use of particular keywords need that.
You actually sell authentic products but one or some of your clients complained to Amazon that items are inauthentic and your Amazon account was suspended.