Hello! I own an HTC Desire Z and I'm having some problems with Vibrate Mode. It's not that I can get the phone into Vibrate Mode and then have the phone not vibrate...it's that I can't even get the phone into vibrate mode. Let me explain... When I use the volume down key, it goes straight from the lowest volume to silent mode and can't do anything else. However, sometimes when I plug the phone in to charge and unplug it, Vibrate Mode will miraculously return. It seems to be completely random though. Any ideas?