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Haha in my case it was a library book! I just rooted my Xperia Z1 Compact yesterday so I worried I'd broken something in the process. Too funny!
I started havind a read error message come up on my sony Z1.
Found this was because i put my new barclays business card into the case with my phone.
Its the wireless technology chip in the card that causes the problem as the phone keeps trying to read the card.
Hope this helps folks.