mine too
Mine does this too. It works perfectly well in all other circa, and it feels like a hardware issue, I mean, sometimes I feel like the home button isn't connecting inside with the proper contact when I press on it, so I press on it 1-4 times until it activates properly.
I have no idea whether its a software or hardware issue, and I don't really care. I just deal with the annoyance since everything else seems to function okay.
The same issue occurs with my MacBook trackpad. If my pointer-cursor is over a link, it will often "click" on the link without the trackpad being touched. I heard there was a documented issue with this, but quite honestly, I'm dealing with it in the hopes that they'll run out of supply some day and when I go in to address it, maybe I can get upgraded to the latest and greatest