Why is the touchscreen responding so slowly?
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.
The LG G4 was released in the US in early June 2015, as always focusing on high-end specifications and a refined fashion sense that makes it stand out in the premium smartphone market. Each version of the phone will have a different model number based on if it is sold by a carrier or unlocked (US or International). Some LG G4's are known to have bootloop problems.
1) If you have a screen protector there might be a problem with it, so try taking it off.
2) If that does not work, try restarting the phone and see if your screen is responding.
3) 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: