What is going on with my iPhone?

My iPhone 7 keeps doing weird things it keeps glitching and going in and out of pages it won't let me click on certain letters on my key bored doe times or certain things sometimes the left side of my phone won't work it goesor clicks on stuff by it self and it types random stuff by it self it just does really weird things what should I do? I had this before on another device now it doesn't work anymore

Do a factory reset first. If that doesn't work, the phone needs to go in for repair.

Back up important data first.

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