IPhone 4S touch screen unresponsive at times?

So this is quite a confusing situation. Basically end of September (before updating the new sucky software) I dropped my phone on the pavement and the screen cracked plus the LCD. I sent it in to a service for repair. Worked good as new. About a month later. End or October. Snapchat stopped working so I decided it might be a software issue so I did the iOS 7.0.3 update. Very Next day I dropped my phone again because I guess I'm that clumsy. Cracked. Worked fine though. Later that night the touch screen kept having moments where it wouldn't respond. It became worse and worse where it wouldn't work for like 4 hours at a time and I need it for work. So I took it in to a repair figuring it was a screen issue. Got fixed. Worked for like two days then started having the touch screen glitches again.

I guess my question is is this an iOS 7.03 bug or a my phone has simply taken too many beatings issue? Please help me out!

I've tried the trick on rebooting it. Works sometimes but not others btw.

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