About a week ago, my phone started freezing to a blue screen, or would have random horizontal lines flickering across. ( I have images of the screen in the thread http://forums.macrumors.com/threads...-blue-screen-and-lines.1894642/#post-21501667 ) I brought to the Apple Store to have it checked out, where they immediately got me a replacement and noted the failure as a 'kernel panic'. It's been a day since I've had the new phone, and since then there have been two occasions where I've been browsing on Safari and the phone shuts down and reboots relatively quickly. I hear it's not a restart, but rather, called a refresh. Either way this doesn't seem like natural behaviour from an iPhone, and I have a feeling that the issues would only get worse with time. I haven't restored it again from the software that was present on the phone when it was given to me (it was the latest update at 8.3). Regardless, should I book an appointment at the store and ask them for another replacement?