I have an original iPad that I got the first day they came out. While I've been very careful with it, about a month or so ago, I began noticing that the home button wasn't as responsive. I would sometimes have to press the button 3-4 times before it would register. I just chalked it up to "old age" and figured at some point I would need to make a trip to the Apple Store, where it would cost me some money to get back into working order. But today, I came across this article that saved me a trip! This also works on iPhones and iPod Touch devices.
Step 1: Open a stock app, like Weather or Stocks. (For the iPad, I used the Video app) Step 2: Press and hold your power button until “slide to power off” appears and release. Step 3: Press and hold your Home button until the “slide to power off” goes away, and the app force quits. Your iPhone’s Home button should now be more responsive, because it has been recalibrated.
I hope if you have a similar problem, this works for you as well. Good luck.