My iphone 4 is going INSANE?

I don't know what's happening but recently, my iphone 4 has been going haywire. It's been playing music on it's own, switching songs, fast forwarding, changing the volume, going on voice control frequently all by itself. I already restarted it and i have the latest iOS update, what's with my phone? It's been a year and a half old though, and i've used 10 GB of space, how can i fix this? It also restarts by itself at times.

The best solution is flash your iphone from the begginning. Then update the latest version. The cell is corrupted due to software or it may be from the downloaded software which you had downloaded from internet. The best is flashing in latest version

I'm assuming it's not jailbroken.
I suggest you restore it. If it's not a screen issue, a restore should fix it.

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