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The only thing that I can think of is that something possibly in your settings got changed. Go to Settings-> Select Page: Hot Keys. Make sure that there is no Hot-key assigned to screen on/off, if it is assigned it could be possible you are pressing this btton. If that is not the problem look into other settings options, I am not sure if they would be the same as mine as I am on an ipaq but there are a lot of options and it could be possible one of them has a timer on the screen.
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