Lagging issues include slow performance and app crashes

This more than anything is due to the large amount of secondary information or cache memory that the application itself has accumulated in the system

Clearing your app cache data regularly helps to keep your phone running smoothly. Sometimes, the cache occasionally saves data or a large amount of data that repeatedly cause an app to crash. 

Might be due to the issue with the firmware updated on the phone. Normal reset might not work as this is firmware issue.

Due to the high power consumption and heat generation of large games.