Omix X600 Keeps Shutting Down Even After Battery Replacement

I am writing regarding the ongoing issues I have been experiencing with my Omix X600 smartphone.

I have been using my Omix X600 for approximately one year, and throughout this time the device has repeatedly shut down without warning. In some cases, the phone powers off suddenly even while it is connected to the charger. This problem significantly affects my daily use and makes the device unreliable.

In addition to the unexpected shutdowns, the phone also suffers from noticeable performance issues. It frequently lags and stutters, making even simple everyday tasks difficult to perform smoothly.

To resolve these issues, I took the phone to an authorized service center, where the battery was replaced. However, only a few days after the repair, the same problems returned. The battery replacement did not resolve either the unexpected shutdowns or the performance issues.

Since these problems have become persistent, I respectfully request that my device be thoroughly inspected and that a permanent solution be provided. If the defects cannot be permanently repaired, I request that the device be replaced with a new unit or that another appropriate remedy be offered under the applicable warranty terms.

I also request a written explanation of the cause of these recurring issues and confirmation of the actions taken to resolve them.

Thank you for your attention to this matter. I look forward to your prompt response and a fair resolution.