Hi Guys,
Same issue here, power/lock button is not really working... had my phone about 4 months. I have tried a different 'case' and no change, still the issue.
It works now and then, like every 1 in 20 presses, i also tried without the case on... and the same thing.. it still presses in and makes the 'click' sound.. but doesn't actually do anything.. maybe again 1 in 20 presses. Was working fine and then one day... not.
Im going to send mine in for repairs as it is SO annoying to unlock/lock the phone.