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Hi,
That sounds strange. Do you experience this behaviour for any specific application? How often does it appear? Perhaps you could boot the phone into safe mode to see if same thing happens:
/t5/FAQ/How-to-boot-your-phone-into-safe-mode/m-p/348008
Well, there are no specific settings for the touch function. Make sure that the screen is clean so there are no dirt that is interfering.