A:AnswerHi.
Give us a call on the link below my signature for troubleshooting and a final determination of the source of the noise.
Charles V. - Insignia Support
https://www.insigniaproducts.com/contact-us
A:AnswerHi Yi.
I appreciate your trust in that we will answer your question accurately. This freezer does not Auto-Defrost. We are always here to help you in case you have need any assistance with it and thanks for your interest in this product.
Charles V. - Insignia Support
https://www.insigniaproducts.com/contact-us