Hi @Dhess, sorry to hear about this.
Does the behaviour persist if you restart you phone in safe mode? All apps downloaded from play store is temporarily deactivated while in safe mode and by doing this, you can see if this behaviour is caused by a downloaded app. For more information on safe mode and how to use it, click here.
If the the behaviour of the touch screen persists in safe mode, I suggest that you try to perform a software repair using a computer and Xperia Companion. Keep in mind that a software repair will erase all user data, so remember to do a backup of your user data first.
Try this and let me know how it goes!
