Chosen Solution
The touchscreen on my LG G4 is responding very slowly, and sometimes not at all. This problem is especially prevalent when trying to use the keyboard.
- If you have a screen protector there might be a problem with it, so try taking it off.
- If that does not work, try restarting the phone and see if your screen is responding.
- If the problem persists, check that you have the latest update on your device, if not go Settings-> System->About Device-> Software Update and update the software. If the problem further persists please refer to the LG G4 troubleshooting page: LG G4 Troubleshooting