Why is IPhone screen not showing?

So when I receive a call my Iphone (6) rings & vibrates but the screen of someone calling doesn't show up for another 3-5 seconds. So I'll be on an app and all of a sudden I get a call but I can't answer it right away because the screen takes a few seconds to show up. What could this be? Do I maybe have a virus or it something else?

I'd try a restore to see if it helps.

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