Iphone 4 Pressing home button by itself?

I bought an phone 4 from ebay for my birthday and on the first day it was fine but sometimes now it does all these crazy things, almost like someone else is pressing the home button. For Example When it's on lock the screen will come back on and if i'm using an app it will go off of it and sometimes onto the screen that sows all your running apps. Also voice control comes up allot and it's very annoying.
I upgraded to ios7 and have the iphone 4, which I bought from ebay. Do you think the phone is faulty or ios7 messed it up an how do i fix it?

Unstuck it

It's likely iOS7 glitches. They did a complete remodel on the system. There have been various glitches with various devices. Seeing as apple doesn't give downloads of past software, you can't downgrade back. ATM there isn't a way to fix this, but there should be as soon as apple releases the next update, which will hopefully be in a few weeks. But if you really want to stop it for the time being, I believe that there's a home button app that temporarily disables the home button and replaces it with a circle in the corner of the screen that is there at all times.

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