I read of this problem on Apple support forums. The problem is that I have a jailbroken 4.0.1 and I'm going to unlock it because I'm going to be in Europe for 4 and a half months starting on Tuesday. I don't want to go to the genius bar and get a phone with 4.0.2 and be screwed. Randomly in the past day, the phone has powered off twice. I hope by running the battery down all the way and charging it up all the way will fix the issue. What are your thoughts? If I plug it into a wall outlet, it will resume exactly where it was before as if the phone didn't even turn off but needed to be wakened from a deep, coma sleep.
If you have your blobs saved for 4.01, it might be worth it to do a restore adn start from a new phone.
I have had the same thing happen twice, the phone seems off but it's actually just the screen refusing to light up. Don't know why either.
I do have blobs saved on TinyUmbrella. last time I did that though with 4.0, iTunes froze the restore process and I had to update to the latest (4.0.1 at the time). I want to be really careful. If I get 4.0.2, I'm SOL.
It only happened twice? I think the phone is a deep coma sleep because the vibrate switch didn't make the phone vibrate. AS soon as I plugged it into the wall, it showed the charging thing (without the apple logo bootup as if it were still on but needed to be really woken up). If it's a rare occurence, no big deal. http://discussions.apple.com/thread.jspa?threadID=2476608&start=0&tstart=0 Suddenly, I'm not as worried about it. LOTS of reports of this.