Completely unresponsive iPhone 3g, decides to work 8 hours later

So I have seen a lot of posts on people's 3g shutting down, but I have yet to find this exact behavior elsewhere although it happened to both my wife's and my iPhone.
I took my phone off the charging cradle (with full charge) last night, made a phone call, locked it and put it in my pocket. 10 min later, I was going to make another call and the phone was completely unresponsive. It would not even respond to a hard reset. I plugged it into my MacBookPro and the computer did not even recognize it and the phone would not charge, anything. I had a busy night so I set the phone aside and got back to it several hours later. When I did the phone was still unresponsive and it was warm as if it had been in heavy use. I then plugged it into the computer again and went to bed. Shortly after I woke up this morning (8 hours later) the phone turned on, completely dead and began charging. The phone now seems fine.
So if you have the behavior above, put it on the sync cradle and walk away for 12 hours or so and it might come back. This has happened once before to my wife's iPhone and as yet we have gotten no response from Apple as to what might be causing it. Right after my phone died I scheduled a call from Apple for this afternoon so if I get any solutions or information I'll post it here later today.

It was suggested to me that this may help you. I hope that it does!
Personally I'd do a 'reset' - it's something that's worth doing whenever you see anything 'unusual', 'unexpected' or 'unexplained', and although there are other 'deeper' remedies (such as 'restore' and 'restore as new', and DFU), a simple 'reset' (done every month or so too) seems to help to keep our iPhones healthy, even when 'Other' memory usage gets high or when there are poorly-developed Apps causing 'issues'.
I hope that it is not a distraction and helps with your problem.
Good luck!

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Completely unresponsive iPhone 3g, decides to work 8 hours later

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