iPhone 6 freezing when receiving a text

does anyone else's iPhone 6 freeze or lag when receiving a text?

it doesn't matter what I'm doing, whether it be texting someone else, on safari or anything else, when I'm receiving a text, my phone will always lag for a second. this is a minor problem, but an annoying one and i was just wondering if anyone else had the same problem or if it was just my phone. I've only had it about 6 weeks, but its always done it and i don't know if its just a fault with my phone. i had an iPhone 5 before and it defiantly didn't have the same problem. none of my friends with an iPhone 6 seem to have the same problem either, so is it worth getting looked at?

I'm with vodafone, would it be best just to send it back to them, or take it into an apple store?

Thanks

Chris