iPhone touch disorder may be caused by software error or hardware failure.
1. Due to the process of using iPhone being tipped, dropped, or impacted. Often these errors are related to hardware, so bring the device to Apple or where to buy the device for the best support.
Avoid falling
2. Using non-genuine accessories also causes touch disorder problems on iPhone.
Use genuine accessories
3. Screen protectors can sometimes be the cause of touch errors as well. In this case, try removing the patch.
Removed error screen stickers
4. Touch disturbance can also be caused by software error. In this case, you can factory reset the device: Settings> General> Reset> Erase all content and settings> Erase iPhone (Note: exit iCloud and backup data before Reset) .
In this case, it does not fix it anymore, you can also try by connecting your computer and iTunes to run the iPhone software again .
Connect your computer and iTunes to Restore iPhone
Above are some integers and how to fix touch disorder on iPhone. You can share more with the community.