iMessage was working fine for me a few weeks ago. My suddenly whenever I get a message from my GF it has started appearing in a new thread. Neither of us have changed any settings. If I send her a message from the original thread and she replies it comes back to my original thread, but if she sends me a message at some point later it comes into the new thread. Turning off being able to contact her at her email address stopped her being able to reach me at all (all her imessages failed to send). We wiped her phone and restored (both phone number and email activated) and it seemed like the issue was sorted, but today it's happened again. I am reluctant to wipe and restore my phone as it takes an age to restore. Is there anything I can toggle to stop this happening (will deleting the new thread solve it)? It is driving me insane!