I've had my Thunderbolt for a week, now. I've noticed for a while that some people have been complaining about the power button "sinking into" the phone, or something? I don't *think* mine is doing that, but I often get paranoid about silly little things like this, so I'm curious, how concerned should I really be about this? Is it a defect that only a small number of people run into, or is it more of an eventual certainty? Is there no way to fix it if/ when you develop it? Are you unable to power on and off your phone if/ when it happens?