So I've been using my iPad on and off all day playing around in iDraw designing a logo. Suddenly, the app slowed to, and the zoom in and out feature went eratic, and suddenly the top of the screen started to flicker (including the part that contains the notification bar) . I pressed home, and went back to the app, it was still being strange, so I closed the app down, reopened it and it seems okay now. Does that sound like an app issue, or a GPU issue? I hope it was just the app, because I really don't fancy having to get it replaced and being given a refurb.