My phone is deleting my contacts one by one? (iPhone 5)?

So lately, I'll go to check my messages and see a bunch of random numbers. Then i go to click on the conversation and realize that i know the person and that i've added them into my contacts before. Obviously, the thing everyone would do is just re-add them… BUT! THEY DISAPPEAR AGAIN! I've tried restarting my phone (off/on) with no luck. It seems it is doing this to mainly the text message people. Not so much iMessage… I don't want to reset my phone completely and lose every single contact… Does anyone know a solution to this?

It's apple.

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