Phone deleting messages

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http://forums.androidcentral.com – My wife has the S3 on Sprint. Randomly she will be typing a message in Facebook app or messaging and it will just delete the whole message. It is somewhat random, it will do it several times over a few days and then not again for a 1-2 weeks. Software is updated and we have reset and hard reset the phone. Any suggestions? Anyone else having the same issue? Thanks in advance (HowTos)