Please try the following:
1. Switch to a different data network or WiFi and try again. Make sure the network is stable.
2. Clear all background applications to ensure that the phone has enough running memory.
3. Reduce the game configuration (image quality, resolution, turn-off special effects) and try again.
4. Keep your phone fully charged. If the power saving mode is turned on, turn it off temporarily to enhance performance.
5. Restart your phone and open the game again.
6. Go to the application management to clear the game's cached data and try again. Be sure to back up any important single-player game data as it'll be lost after you clear the cached data.
7. Check if your phone has just been updated. If so, restart and try again.
8. Ensure the game and phone system are updated to the latest version.