Help: phone shutting down continuously

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http://forum.xda-developers.com – Hi everyone, for the last two months I've experienced a serious problem with my sensation; the phone shuts down inmediatly withouth any fixed reason, sometimes happens when I unlock the screen, others when taking a picture, also when playing music, etc. Then from one shut down to the next boot the battery level change drasticaly, from 60% -> 20% , then in a while another shut down happens and the battery comes back to 50%, I honestly don't understand. The shuts down always appear with a battery level <60% This behaviour happened to me with ViperS 1.6.0-2 , CM10 and now again with Hyper (HowTos)