Why is my iPhone randomly deleting my contacts?

I have an iPhone 4S. Sometimes, my phone will randomly delete my contacts and it's so annoying. I'll go to my recent calls and texts, and the numbers will still show up. It's just the names that are missing. When I go to my list of contacts, it's empty. What's going on and how can I stop this? It's happened like 4 times already and it's getting annoying. I've only had my iPhone since October, so why is it doing this?

Thats really weird. I have no idea. Make sure no one is using your iphone.

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