my psp randomly locks itself

[hyunwoo0321]

i have psp 2001 with 5.50 prome4

my psp works fine when i play any other games until i play monster hunter 3rd (all launched from memory stick)
after about 2 hours of game play, key logo will appear where the time is displayed (it flickers on and off very fast) even though power switch is not in hold position. when that happens none of the buttons will work including power switch, only way to turn it off is to take the battery out.
after i take out the battery it will not turn on instantly. i have to leave the battery out for 1 day if im lucky, usually takes 3-4 days to turn it on
i try turning it on once each day. when it turns back on, same problem all over again (works for 30min-2hours locks up again)
i've tried reinstalling cfw, formatting flash1 all that good stuff but these method does not solve this problem
i love playing monster hunter but i cant enjoy the game because of my weird acting psp

please help me and thank you in advance

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[sandeep30]

what is the condition of hold button?

[hyunwoo0321]

power switch is in good condition. my psp is having software problems. oh and also when my psp locks itself, it dosnt freeze completely, game would be still running but keys wont work

[El Guapo]

Probably something with the power/hold switch or the "HOME", "SELECT", "START" strip of buttons