Battery draining when using Exchange account

Hi,
I'm currently using a iPhone 3Gs with iOS 4.3. I alos syncronize it with a MS Exchange account (manual).
For the last 3 months or so, my battery seems to drain. It seems as if the connection between the phone and the exchange server doesn't disconnect after I've been searching or scrolled in the contact list.
I've tried the following actions but with no effect:
- Rebooting the phone
- Restore to a new phone
- Uninstall the exchange account, reboot and install the account again (makes it work for a few days in best case)
- Close all open applications
- Set the sync between the phone and the exchange account to manual (also in advanced settings)
- Manually drain the battery to empty and after that charged to full
I would be very greatfull for any tips, hints etc since I have to use the phone in my work.
Kind Regards PelleM

Here's a "me too" post. I'd love to hear if anyone makes headway with this. I am the outside Mac geek for a company that has an exchange server, mostly PCs and a handful of Macs and iPhones. All the iPhones are working like a champ save one on which the Mail application periodically stops working with the Exchange account. The calendar and contacts from the exchange account continue to sync just fine, but mail app will simply remain blank when the user clicks on the inbox.
I've been able to kill the account (on the phone) and re-setup and it'll work for 2-3 weeks and then one day simply stop. I've restored the iPhone to factory defaults twice now. This past time I've not restored the contents of the phone from a backup, but rather set it up as a new phone. We'll see if that makes a difference. I've also setup the Exchange mail account as an IMAP account as a backup. Other accounts continue to work just fine when this happens--it's just the Exchange mail account that flips out.
At any rate, if anyone has any additional info/experiences, please post as I'd be curious. I'm hoping this most recent reset will do the trick, but I'm not confident it will.
Cheers,
Stephen

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