IPhone settings lost when the battery is flat

Hi,
I've had this problem 3 times by now.
I leave my iPhone 4 on the desk at night when it is low battery. And next morning... of course the battery is flat because I didn't put it back to charge...
Anyway, the problem comes when I get my battery back to 100% and I turn on my iPhone...
I realize then that the calendar is back to 1st january 1970, and when I try to open any app that didn't come with the iOS 4.2.1, I just can't open it... It's like the iOs doesn't recognize the apps installed. So i have to synchronize back my iPhone iwth iTunes to get the apps running again...
Does someone know a solution for this? (other than not letting the iphone battery go 0% nor synchronizing the apps each time I have this issue)

Hi
I've had the same issue about 4-5 times now as well. As soon as my iphone 4 runs out of battery and is not being charged for another few ours it 'forgets' its date and time settings and resets to 1/1/1970. I am really surprised Apple didn't put in a small extra battery to keep this basic stuff running indpendent of the main batterie's life!!
What's really annoying about this though is that when I set the date again (the auto setting doens't work for some reason) I then have to OK reminders for events from the last months which atm takes ca 10-15 minutes of stupid tapping with no chance to get to any other parts of the OS!
If anybody has a solution for this that be fantastic! Also if this is not supposed what should happen let me know too as my iPhone has been doing this pretty much from the start (got it only end of Nov 2010) - then I should get in touch with Apple I guess...
Thanks!

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