I need help plz for my psp?

my psp didn't had a problem till now, i had played my nba 2k10 cso for a month and no freakin problem till now the problem started when the game started crashing from time to time and then it went on to my players moving without me controlling them also the menu selection and the game froze with the orange light blinking for a long time and i press home and it said please wait for a long time till i just held the power on and when i turned on the psp and press select wich brings out the vsh menu the psp froze in the xmb and i went to the guy to fix but he said there maybe a problem with the iso so i deleted it and my psp starts having prblem gamebooting and starting games sopmetimes and stuff like that i need help my firmware is 5.50 gen d2