I, too, had that problem after I forgot and left my PB360 in my car (in western NY ... in the winter!) for a couple of hours. I had that same ghosting affect when I turned it on. I did wait for a bit in an effort to warm it up, but still got the ghosting.
However, after some page turns refreshed the page, it's just fine. I can only assume the PB360s do not like being cold (I'd be willing to bet there's an operating temperature range).
So, here's hoping yours will refresh its way back to being fine, just like mine did.