I was just wondering what part of iphone is responsible for the sensitivity touch of iphone 6?

Sometimes the screen of my iphone 6 is moving by itself and clicking random things. Sometimes it also stops responding and just hangs. And sometimes my finger is not touching the screen and it starts typing and clicking stuff. I tried to hard reset and factory reset but it didn't work. Is this just a faulty screen/lcd? Or motherboard problem? Or what?

The digitiser.

I've never heard of that happening.

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