Just installed 3.0 on my 3G a short while ago. I wanted to reboot my phone - turned it off holding the sleep button and then moving the slider, then turned it back on with the sleep button, and it got stuck at the Apple screen. I had to hold down the sleep and home keys until it shut off, then turned it on again and it took a while to start but it got past the Apple screen. I tried rebooting again, to see if maybe that was a one-off problem, and it did the same thing again. Except this time, restarting with the sleep and home buttons didn't work, it got stuck at the Apple screen again - it required a second try, and finally booted back up, still taking a while to do it again. Is anyone else having this problem? I'm afraid to turn my phone off now. :\ Sorry if this was addressed already, I tried a search and didn't come up with anything.