Why won't my touchscreen on my iPhone 3GS work?

Why won't my touchscreen on my iPhone 3GS work?
Ok, really weird stuff going on with my phone. I have an iPhone 3GS (will soon be getting the 4G, but in the meantime I gotta deal with this one). And it's super awesome, wait let me rephrase that "it WAS super awesome". Now, not so much. It flippin' hackin' acts up ALOT! The screen just randomly decides to not work, at all. It won't let me unlock it, click on apps, mute, put on speaker, slide to turn off, NOTHING! Not even the left side of it works when it gets in this "mode". And there's no pattern either, just randomly acts up and randomly fixes itself. I tried turning it off by pressing and holding the lock key and home key at the same time and then started to freak out because it looked like it wasn't shutting off correctly (but I got over it), and it turned off. Then I turned it back on and it didn't even help it. But I do have to admit, I did get a little pissed and threw it on the table a little too aggressively, and that's when I really noticed it happening (but it did happen before that, just not as badly). OMG! I just had an idea of hitting it on the counter to try and reverse it… WHOA! It worked, how funny. Well, I still wanna post this because in case this happens again and the banging doesn't fix it again, I want to know a different solution.

You phone need a software update. Check your software version.

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