Galaxy note n7000 turns off automatically

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http://forums.androidcentral.com – I updated my note to JB... But since one month my note turns off automatically.. At first this behaviour of my note was not much hetic... but now it gets switched off frequenty... Today morning also it turned off 2 times within 20-30 mins.. It gets turned off when it is not in use... i.e. when its on stand-by.. What might be the exact reason behind dis... ? I m getting frustrated due to such behaviour of my note.. as we all know that it costs high.. so we dont expect such type of activity after paying such a huge amount..... Please help me solving dis prob... My note is fully packed... (HowTos)