Support Hangs on unlock screen

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http://androidforums.com – Hi all, My S2 has this annoying habit where it freezes up when unlocking - this happens several times a day now, and seems to be at random (ie. not every time, but I haven't noticed a pattern of anything different between when it freezes and when it doesn't). I press the home or lock button to wake up the phone and I see the lock screen but the Menu and Back buttons don't light up and the touch screen doesn't respond. I usually try a few more times and then either the screen stays black when I push the home button, or just the Menu and Back buttons light up (nothing else), or it once aga (General)