Iphone 6 plus lag question

Hey guys! While setting up my iphone 6 plus I noticed some pretty serious lag issues. I was hoping to figure out if it is just a general issue with the phone or if I got a dud that I need to replace :\

I was playing music on the phone and surfing the web on Safari and noticed that sometimes (not every time but too often to be ignored) when a web page would be loading the music would lag or totally stop and take quite a long time to start up again. A few times the web page and music would stop for a bit.

Just wondering if this is just a quirk of all the phones or if I need to bring it in to Apple.

Thanks in advance for any advice