Flex Mobile: PersistenceManager not saving data (only on some iPads)

I have a function (save()) that saves a username after user login and a function (get()) that gets the username everytime the App is restarted so the user doesn't have to log back in and can work offline. This works on my iPad 2 and 3, but I have another iPad 3 that this does not work on. When the App is fully closed and reopened the "username" is not held onto. Is it my code or the device?
Example:
public var saveData:PersistenceManager = new PersistenceManager();
public function save():void
saveData.setProperty("username", txtUsername.text);
saveData.save();
public function get():void
var username:String = null;
if(saveData.getProperty("username"))
//This comes back null on one iPad but not the others
username = saveData.getProperty("username").toString();

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SELECT x.sak_release_db
, x.sak_object
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'SELECT b.nam_schema||''.''||a.nam_technical as table_name , b.sak_object
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Florian,
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Flex Mobile: PersistenceManager not saving data (only on some iPads)

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