IPhone is deleting contact names

So I've recently added a few contacts on my iPhone 4 and suddenly now it's only coming up with my contact numbers and not their names. So someone with a random number will text me but I'll know it's them because I can look at our previous conversations. How do I get it to stop deleting names of contact numbers?

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I have the same issue, they will be in my contacts list and then I get a text from them and all their contact information is lost.

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