About overheat device heating issue in regular use, we suggest that you avoid running apps that may use much memory for a long time, for example, 3D games and video.
Also, it's recommended that do not use your phone/tablet while it is charging.
Please also try removing the background apps in recent app list, and check again.
Please also check if this behavior appears in safe mode: https://www.asus.com/support/FAQ/1005163/
For more information on improving the overheating behavior: https://www.asus.com/support/FAQ/1011555/