The reasons for the qualitative change in the sales of quick-frozen dumplings are related to improper storage conditions, damage during transportation, and problems in the production process.

1. Improper storage conditions: Quick-frozen dumplings need to be stored in a low-temperature environment. If the storage conditions are not up to standard or exceed the shelf life, it may cause the goods to spoil or deteriorate.

2. Damage during transportation: Dumplings may be affected by vibration, extrusion, etc. during transportation, resulting in packaging rupture, damage or contamination, thus affecting the quality of the product.

3. Problems in the production process: Problems in the production process, such as material selection, mixing, production, and cooking, may also cause the dumplings to have a worse taste and lower quality.

Enterprises should attach great importance to product quality during the production and sales process, strengthen management and monitoring, ensure the freshness and quality of dumplings, improve customer satisfaction, and enhance corporate competitiveness.