Hi @Micks, welcome to the community. I am sorry to hear about this.
Try these methods one after the other. Verify whether the problem was solved after each method, before trying the next one.
- Turn off your device and then turn it back on.
- If your device has a screen protection film, make sure it's specifically intended for your Xperia™ model. It is important that such a protective film has the holes for the proximity sensor and the front camera in the correct positions.
- Make sure that there are no air bubbles, dust or moisture under the screen protection film.
- Wipe the screen with a clean and dry cloth to make sure that your touchscreen is clean.
- Make sure that Developer options is disabled. If Developer options doesn't appear in the menu, it's already disabled.
- Use Xperia™ Diagnostics to carry out a quick test to check the touchscreen functionality. Xperia™ Diagnostics can assess potential hardware or software issues on your Xperia™ device.
- Restart your Xperia™ device in safe mode. Use Safe mode to check if any downloaded applications are causing the problem. In Safe mode, your device only starts with software and applications that were already installed when you purchased your device. If the device’s performance improves in Safe mode, it’s likely that one or more of your downloaded applications are affecting the device negatively.
You can exit Safe mode and restart the device to uninstall the applications that you suspect are causing the problem. - Check if there is a software update available for your Xperia™ device using Xperia™ Companion. Tap or click here to read more about how to update and find the latest software version.
- If you can access the device menus, perform a factory data reset. Note! A reset will delete all personal content saved on the internal memory of your device. Back up data that you want to keep. Content on an external SD card is kept.
- If you can't access the device menus, perform a software repair using Xperia™ Companion. Note! All data in the internal memory is overwritten during a software repair. Content on an external SD card is kept.
- If the screen still flashes or flickers, comtact your Local support team.
