TS2755: iOS: Troubleshooting MessagesLearn about iOS: Troubleshooting Messages
Currently Being ModeratedOct 1, 2013 12:28 PM (in response to jessicadparrish)
Thank you for using Apple Support Communities.
It sounds like even after restarting, resetting and closing your apps, the Messages app keeps quitting unexpectedly.
You did exactly the same troubleshooting I would have done, if this happened to me, and next, I would try backing up and restoring your phone with iTunes.
iOS: How to back up and restore your content