Just for clarification, do you mean it sticks in the sense that it depresses and then doesn't come back up right away? Or do you mean it sticks in the sense that it doesn't depress properly and thus doesn't touch the sensitive pad underneath it to invoke the Home Button pressed action?
Okay that's a different story then. I've experienced that myself. You need a swap-out. They will definitely fight you on it though, so be firm. It's normal wear and tear no matter how they try to pin it on you or try to say it's the way you're pushing the button.The latter! Sorry for the lack of clarification.
Would they still swap it out considering that I've had it for several months and the problem is new?