Hi, I just bought my sister an iPad mini with retina display a week ago. She opened it yesterday and she used it for a while. I thought continuty was enabled (iMessages) but didn't realize it wouldn't be until this fall, so I updated her from iOS 7 to 8. Now she's complaining of extremely slow wifi. I don't think it's our network as my Note 3 connects just fine. Should I exchange the iPad?