Sorry for any inconvenience it may cause. Kindly provide the information below so that we could better assist you.
1. Model Name: Settings>System>About phone
Refer to the link below to check the model name by model no. in the linkhttps://www.asus.com/support/FAQ/1014441/
2. Your current firmware version
Settings>System>About Phone>Build Number
If you try to update to the latest version, does the issue still remain?
3. To avoid personal information leaking, kindly reply me the PM with your RMA number.