The palm support people keep insisting that it is an app that causes luna resets. I have been testing this by deleting an app for a day or two and seeing if it makes a difference then reinstalling it. I think, ironically, that the precentral app is the issue. If you are experiencing random restarts, try uninstalling that app for a few days and see if it makes a difference. I'm on day 4 of a reset-less Pre 2. Its so much nicer.