@Junsoh
According to what you described, please refer to the following FAQ to try to troubleshoot your Wi-Fi problem first.
https://www.asus.com/support/faq/1006657
If the issue persists, I have PM you for confirming your product warranty.
Please check the PM inbox at the top right corner of the screen and kindly provide the requested information.
Sorry for any inconvenience it may be caused.
