[D3TO]

For a few weeks now, my vox has no memory of previous sessions after a power-off, which makes it pretty well useless. If I download books, email, insert settings, use a bookmark - none of these activities will survive a power-down. When I power up again, it's as if I hadn't done anything. This even extends to factory resets - I reset, then power up, and it's forgotten the reset and all my settings, email etc. have survived the reset.

Kobo email support has been painfully slow and inept. This morning I called in and was walked through 3 different factory resets - nothing worked. (It's being escalated and who knows when I'll hear back - I thought my complaint was already at level 3, at least that's what I was told earlier.) I have until Monday to return this device and I don't want to do so without blowing away all my personal information on the device. Any suggestions for reset???

What I've already tried:
1. factory reset under the Privacy setting
2. powering up while depressing volume up button
3. popping the back cover off and pushing in the reset button by the battery
4. unplugging the battery for a minute before re-plugging.

Thanks.