Why does my cellphone move by itself when I use it to play games?

If your Oppo A5 (2020) seems to move by itself when you're playing games, it's likely due to one of the following reasons:

1. Touchscreen Sensitivity: The touchscreen may be overly sensitive, causing it to register unintended touches or swipes. This can happen if there's moisture on the screen, if you're using a screen protector that's not properly aligned, or if the touchscreen calibration is off.

2. Background Apps or Notifications: Other apps running in the background or incoming notifications may interfere with your gameplay by causing the screen to momentarily flicker or register unintended touches.

3. Gyroscope or Accelerometer Issues: Some games utilize the phone's gyroscope or accelerometer for motion-based controls. If these sensors are malfunctioning or not calibrated correctly, they could cause the phone to move erratically.

4. Software Glitches: Occasionally, software glitches or bugs in the game itself or in the phone's operating system can cause unexpected behavior during gameplay.

To address these issues, you can try the following troubleshooting steps:

- Clean the Screen: Make sure the touchscreen is clean and free of any dirt, debris, or moisture. Wipe it gently with a soft, dry cloth.

- Check Touch Sensitivity Settings: Go to the device settings and look for touch sensitivity or touchscreen calibration options. Adjust these settings if necessary to see if it improves the issue.

- Close Background Apps: Close any unnecessary apps running in the background to reduce the likelihood of interference during gameplay.

- Update Software: Ensure that your phone's operating system and the game you're playing are up to date. Software updates often include bug fixes and performance improvements that could address the issue.

- Restart Your Phone: Sometimes, a simple restart can resolve temporary software glitches or issues.

- Check Game Settings: If the issue only occurs while playing a specific game, check the game settings for any options related to motion controls or touchscreen sensitivity. Adjust these settings as needed.

- Test in Safe Mode: Boot your phone into safe mode to see if the issue persists. Safe mode disables third-party apps, allowing you to determine if the problem is caused by a specific app or software.

If the issue continues after trying these steps, it's possible that there's a hardware problem with your phone's touchscreen or sensors. In that case, you may need to contact Oppo customer support or visit a service center for further assistance.