It seems to be stabilizing. I wonder if there was a fault with the SD card. Other people have had this problem, and for many it has gone away with a soft / hard / factory reset. I have found the 650 a bit flaky sometimes. I've put it down to bad epubs, though quite why a book, once deleted, should continue to upset the reader is beyond me. The OS should reset and clean itself out on reboot. I think problems generally occur because of font setting in epubs.
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