Hi samratpaudel18,
Please try reinstalling the app and check if the problem still exists.
If yes, could you tell me your current firmware version and PUBG version?
After how long of entering a game does it start to lag?
If possible, please show us a short video of this problem. This could help us look into the problem greatly.
To share videos, please upload to ASUS WebStorage (https://www.asuswebstorage.com/navigate/)or any other cloud storage website, and share the link with us.
Thank you for your help 🙂