How can I be responsible for losing something after paying the property fee?

Legal analysis: it needs to be analyzed according to the specific situation. You can check the surveillance video to comprehensively judge whether there is dereliction of duty or fault on one side of the property.

Legal basis: Article 942 of the Civil Law of People's Republic of China (PRC) stipulates that the property service provider shall, in accordance with the agreement and the nature of the use of the property, properly repair, maintain, clean, afforest and manage some owners in the property service area, maintain the basic order of the property service area, and take reasonable measures to protect the personal and property safety of the owners. Property service providers shall take timely and reasonable measures to stop acts that violate laws and regulations such as public security, environmental protection and fire protection in the property service area, report to the relevant administrative departments and assist in handling them.