Dear Prasit,
Sorry to keep you waiting.
As this is a weakness of production process and it cannot be distinguished which are qualified products from appearance, we decided to recall these units(total 100) back.
We apology for making this inconvenience and please understand this action is to reduce complaints and doubts from customers.
We will send you 100 qualified units to you in advance as soon as possible so that it will not affect the demand on the market, and please return suspected ones through RMA procedure.
Besides, this issue only occurred on this batch, so please don’t worry about the new products.
Thank you very much for your support.