My iPhone 4S keeps spazzing out?

So my phone worked fine today. I went to the mall and out to dinner and what not. When I got home I plugged my phone into the charger and let it charge to 100%. Then I layed in bed and picked up my phone. All of a sudden when I swiped unlock it went to my password screen and it started typing a bunch of random numbers when i wasn't touching it. Then when I unlocked it it kept opening random apps. So when I locked it, and unlocked it again it worked okay. But it happens on and off now! And sometimes it will glitch. I've had this phone for a year and 3 months and never gotten it wet or anything. And I don't have an upgrade. Why is my phone suddenly spazzing?

I was thinking maybe it's a hardware problem. The screen might have been pushed down hard or something like that and causes the screen to go deeper into the phone. Get someone to fix it I'm sure it's some kind of hardware problem.

Its not jailbroken right? Try turning it off and back on, or if it continues then restore back to factory.

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