Your PSP is probably freezing due to old age. As consoles get older the hard drives inside of them begin to slow down and run less effectively.
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Bring your PSP to a game store (like Gamestop) and ask them to fix it.
delete the data and puted in your psp
Go to the repair shop that it can fix your psp. If you don't see one find someplace else
Charge it...
Appart from the first answer....what i did was keep my receipt and called the customer service. They suggested i get it in before 30 days even though i had a warranty...(by the way it did nothing to the warranty i personal paid for) so i was still able to keep my warranty and get my psp repaired.