Amazon review loss usually occurs when buyers are dissatisfied with the product or the seller's service and give negative reviews. It may also be due to an error in Amazon's system that causes the review to disappear.

Sellers can improve their reviews by contacting buyers to communicate and solve problems, and by providing high-quality products and services.

In addition, Amazon also provides an appeal mechanism, where sellers can appeal inappropriate reviews, which may be deleted or modified after review. Maintaining good product quality and customer service is an important way to avoid review loss.