"There were some reported issues when the phone was first released. The hinges were simply loose, allowing for too much movement of the keyboard. This lead to those that push harder on the buttons, to warp the hinges further (which would be those that reported a 'dangling keyboard') Once the issue was noted, all phones that were sent out after that were corrected. Those that did have the loose hinges received an exchange with the corrected hinges."
Looks like Tmobile/HTC corrected the problem!