iPhone 4 locks up in Contacts (over 6000 contacts)

in iPhone edited January 2014
Hi everyone. We have a user whose iPhone 4 locks up frequently when he's moving around in his Contacts. Also, sometimes when he goes into a contact and starts to type out notes in the notes field the characters will be totally gibberish, and it's not because he's pressing the wrong keys. Any thoughts on how to resolve this issue?
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