Xperia V standby hang, cannot wake up

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http://forum.xda-developers.com – anyone experience Xperia V cannot wake up or hang in standby? it happens at nite after i sleep. but when i wake up, i press the power button several times but the screen doesnt on. notification light is working and blinking. only way is to remove battery. its been happening everyday. even alarm is not working. checked my backup(sms, call log), it didnt backup. :crying: (HowTos)