iphone 4 power wake sleep button not working

iPhone 4 Power, Wake / Sleep Button Not Working
location: macrumors.com - date: February 22, 2012
My iPhone Power, Wake / Sleep Button has recently become unresponsive. Having to push really hard to make it work. Today it seems completely dead. I took it to the Apple Store for them to look at. As it is out of warranty it will cost £119 to replace. I need to think about this before i replace it. The genius told me about AssistiveTouch and how i could use that to lock the screen. My only concern is if the iPhone crashes / freezes, the battery runs out, i won't be able to restart it by holding down the power / home button. Is there away to restart the iPhone if it freezes without pressing the power button? The genius mentioned that if the battery died and i connected it to power via the usb cable and it would work. If it froze would connecting it to the power restart it? Thanks.
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