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I've had the same issue since 3.1 update. Cannot get the screen to wake up. The only thing that has worked for me is the reset (home + sleep). This happens a few times a day. I am a MobileMe subscriber with push enabled. The past few times it has done this, I have performed the reset, and as soon as the iPhone completely boots, I get the new email sound and have items in the inbox. Maybe this problem is with the mail app. I do not remember if this was the case the previous instances when it became unresponsive, but I will see if this is a trend in the future.
I've had the same issue since 3.1 update. Cannot get the screen to wake up. The only thing that has worked for me is the reset (home + sleep). This happens a few times a day. I am a MobileMe subscriber with push enabled. The past few times it has done this, I have performed the reset, and as soon as the iPhone completely boots, I get the new email sound and have items in the inbox. Maybe this problem is with the mail app. I do not remember if this was the case the previous instances when it became unresponsive, but I will see if this is a trend in the future.