Red rice note5 flashes back when playing games? What is the reason?

First, find "Developer Options" in the settings and open it.

Open the "forced shutdown" item displayed at the bottom,

Then when you return to the desktop, you will find a flash back prompt, indicating that xxx input method is going to quit.

It's easy to know the problem. After deleting the input method, flashback ends.

Reinstall an input method and update it to the latest version. The mobile phone finally works!

If the input method is abnormal, it will cause the program to flash back. I suggest you install more than two input methods, just in case.