My home button doesn't work very well, I reset and restored my Ipod but it still doesn't work

I've had this 4th gen. IPod since about mid-June, and it worked fine up until about a month ago. The home button doesn't work very well, and by that I mean if I'm in an app and hit the button once, it won't respond, or it'll think I hit it twice. If I hit the button twice, it either won't respond, or it will think I hit it once. I took it to the Apple store where they reset it. They said that if that didn't work, then to restore it. Well since resetting it didn't work, I restored it, and that didn't work either. I've had the same generation IPod before and never had this problem. Any advice?