If you are using a desktop, have you tried to reinstall graphic drivers and directx runtimes?
Also you can send us (to [email protected]) crash logs and logfile that reflects this issue.
Make your way to game installation folder/logfile. Here you can find all logs with the timestamps, you then can remember when the issue happened and send all possible logs to me.
For crash report:
Make your way to C:\Users\Your username\AppData\Local\Temp\duoyi\Gunfire Reborn\Crashes. You can also find there're multiple folder within.(Make sure hidden files are shown in the Windows setting)