Samsung Galaxy S2 stuck on boot screen

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http://androidforums.com – Hello, I have a Samsung Galaxy S2 and recently it has started acting up. It would often suddenly turn off and/or restart by itself. Sometimes when I'd get it out of my pocket, I would notice it has turned off and I turn it back on and everything's fine. Only this time it won't do that. It will show the boot screen, but then gets stuck at the glowing "Samsung" screen. I've gone to Recovery mode, did the 'wipe cache partition' thing and then rebooted the system but then it would do the same thing. Also I'd like to mention that I have no use with the Download mode as my connect (General)