Thank you for your asking. 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
Setting >System>About Phone>Software information
If you try to update to the latest version, does the issue still remain?
3. Does the keyboard issue start after any firmware/app download or update? Does the keyboard perform well in "Safe Mode"?
# How to enter and exit "Safe Mode"https://www.asus.com/support/FAQ/1005163/
4. Please try to re-boot your phone and remove the Screen Protector if your phone has one.
5. If the situation remain the same, does the issue appear in any specific space on the screen? How long and how often does the issue resist?