lg g8 chicken touch is not very sensitive

Maybe the phone has insufficient memory.

You are running too many software at the same time, causing lag. You can clear the phone's memory or close the software that is running at the same time. If it doesn't work after doing all of these, then try changing your phone.

If the touch screen of your mobile phone completely fails, it is recommended that you restart the machine and observe again. Try updating the phone system version again (note: please back up the data in the device before upgrading). Then, if it doesn't work, back up the data on the device (contacts, text messages, photos, etc.) and try restoring to factory settings.