Had an iphone 5s and had issues with my texts disappearing, then not getting them from anyone sending them to me. The store said it was a memory issue, so I upgraded to a 6s with more memory - and the problem is still happening.
That is definitely strange that this is still happening. Are you using the Messaging App or a different application? Are they disappearing after you read them? Are all messaging disappearing or only iMessages?
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