I just got my 32gb grey yesterday. I've used it for about 8 hours total so far and had it randomly rebooted on me 4 times. Twice was browsing the Tegra Zone, once in the market, and once in the browser. Immediately after opening it yesterday I signed into my google account, stopped it from downloading anything from the market, and then forced the update to ICS. Essentially I didn't touch anything until ICS was loaded. Does anyone else have this issue? Is mine defective?