@boiiii start by making sure you back-up all of your files. Then do a hard reset. Here are some instructions:
It is highly recommended that you complete a backup of the device information and disable Device Protection before proceeding with the steps in this tutorial.
With the device turned off, press and hold the Volume down key.
Note: If Device Protection is not disabled, the login credentials for the Google account currently associated with the device will be needed to set up the device after the reset.
With the Volume down key held down, press and hold the Power key.
Release both keys when the Android screen appears.
Use the Volume keys to scroll to RECOVERY MODE.
Press the Power key to select RECOVERY MODE.
When the No command message appears, press and hold the Power key.
While holding the Power key, press and release the Volume Up key.
Note: Release the Power key when the Android Recovery screen appears.
Press the Volume down key to scroll to Wipe data/factory reset.
With Wipe data/factory reset highlighted, press the Power key.
Press the Volume down key to scroll to Userdata only, then press the Power key.
Once the wipe is complete, with Reboot system now highlighted, press the Power key.
The device will restart.
The device is now reset and ready for use. from here.
If that still will not resolve the issue, you most likely need a new display assembly since that is where the "ghost touch" usually originates from.
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