This worked for me... Battery life.

I have had my 3g for almost a year and have been very happy with it. Last week it started acting up. The phone was always hot and wouldn't hold a charge. I tried all the suggestions I could find about turning things off, checking email, shutting down the phone, hard boot the phone, let the battery run out, this setting, that setting... The battery would always run down in about 3 hours even with out use. On Friday it wouldn't even charge from the usb port. It was terrible. I thought I would have to make a trip to the Apple store to get either a new battery or new phone. Well I write software for a living and I wanted to document the discharge rate before going to Apple. A little searching I came up with an App (System Activity Monitor) that had a battery monitor that sounded reasonable. After installing it I discovered it had more features than that. It had a process list and cpu monitor. I watched both for a short while and noticed that the cpu would spike at 100% for about 10 seconds then fall back down to about 50% for 1 second and repeat. Each time it spiked one process would move to the top of the list "dataaccessd" So a little searching on the web and I find out that this process is related to exchange/active sync. So I disabled the email accounts and the Exchange sync for Mail/Contacts/Calendars. Then re-enabled them one at a time. Each time checking the cpu usage and the process list. When I was done enabling each one the phone was fine again. The cpu usage stays around 10% most of the time. The active sync must have been in some kind of confused state and by disabling it and enabling it the problem finally cleared and my phone is back to what it was originally.
I know this is long but I only share this hoping it helps someone else.

Unfortunately, this isn't working for me. I sent an e-mail to Apple explaining the problem, basically my download of a music video was almost complete when I got an error and was told to try using the 'check for purchased music' function you used. Previously, this has worked fine, but for some reason the video is flagged as having been downloaded when it has not.
As I said, I sent an e-mail to Apple. I'll let you know if there's a change in the response to the 'check for purchased music' function or what Apple's response to my e-mail is. I'm sure they'll solve the problem for me. It's a minor inconvenience. Besides, this is after all a brand new and clearly already very popular service! I suspect their servers are somewhat overloaded...

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