ehPhone.ca - Canada’s iPhone Home!

http://support.apple.com/kb/TS3054
Apple recommends that you download this update now.
It’s a pretty hefty update, but early reports indicate that it’s already working for those who had problems with their iPhones not waking from sleep.
iPhone and iPod touch: Unable to wake from sleep
Last Modified: October 08, 2009
Article: TS3054
Symptoms
Some iPhone and iPod touch devices using iPhone OS 3.1 sporadically [...]

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written by mMichael \\ tags: 3.1.2, iPhone, iPhone 3g, iPhone 3GS, OS, sleep, wake