On my Kindle 2, when I press the decrease volume button, I can feel it depress and here a small "click". However, when I try to increase the volume I can not feel the button give under my finger. Although pushing against it will sometimes increase the volume, I cannot tell when it does and by how much. For other Kindle 2 owners out there does your volume toggle work the same way?

Someone also has similar issue, here is the thread discussion: http://www.mobileread.com/forums/showthread.php?t=41083

Thanks for your help! I've just contacted Amazon Customer Service and the replacement is on its way.