Well in the end I weighed the choices and decided to go to Amazon first, partly because even if Kubricking the device fixed it, I'm not sure I would still trust it. And partly because this problem is so strange I think they ought to know about it.
So I was on the phone for an hour with a very pleasant and likeable guy and we established that you also can't upgrade the software (it appears to work fine, but on reboot nothing has changed) and that any books I add also disappear on reboot, as you might expect, and that no-one in his office has ever heard of such a thing before.
Waiting for them to look over the logs and get back to me now (probably Tuesday), but if I ever learn more, I'll be sure to let you all know. Thanks very much for your time and attention.
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