After ICS updates I had daily reboots and Asus logo freezes (stock, unrooted, tried factory resets). Then I disabled wifi in sleep mode and I haven't had a single reboot in 2 weeks. I even tried leaving it in sleep mode without waking it for 4 days straight, and it did not reboot. I'm reasonably happy with it now (of course there's still the issue of choppy hd video playback)