[HELP] Touchkeys not working

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http://forum.xda-developers.com – Hey guys just moved from Sony xperia mini to sgs2.:) Awesum phone but a problem occurs of menu and back touch key every now and then. Touch buttons won't work sometimes and again start working if i remove battery and reboot. Attaching my phone details below,just root with cf root for LP7 but this problem is since i bought phone. Any help is welcomed Thanks Attached Thumbnails   (HowTos)