I also experienced reboots. Two reboots happen exactly when I pressed "I agree" in app manager during install from maemo-extras devel and testing. The other reboot happen during install of large package (openarena - >200MB) over wifi. After reboot the all install went fine when I tried it again. All of the tree reboots happen during first 12 hours after first turning on. Since then (about 30 hours) no reboot at all. I ordered mine through Polish nokia shop (sklep.nokia.pl). I'm not using localization settings. I have not enough info to file a bug myself but maybe we (as a whole) should file a collective bug about rebooting? What do you think?