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Help accelerometer and unlocking screen problem

I bought my S2 one months ago.
Sometimes when I want to unlock the touchscreen by pressing the home and power button nothing happens. After about 10 seconds the screen lights up a bit but it doesn't respond to me swiping the screen to unlock. Then it goes dark again. When this happens the only way for me to unlock the screen is to wait a few minutes and try again.This problem not frequent.do not happen everyday.
The other problem is that the autorotation function sometimes stops working for no reason. It is still enabled in the menu,is it accelerometer problem or software problem..anyone facing the same problem...any solution....really appreciate any help and solutions..thanks...
 
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