Iphone memory drain due to exchange: help

For a month a thought I solved this problem, but than it came back. Now I am without solutions and hope some genius here can help me.
Three months ago my iphone started with serious problems:
- battery life went down from 2 days to 6 hours
- apps crashed (all kind of apps)
- and email stopped working properly: e.g. I deleted emails, closed the mail app and after opening it the same emails where there, unread.
I tried everything: soft reboot, hard reboot, reinstalling factory settings and putting back apps one by one, as a habit delete all open apps regularly, and I checked all possible settings which are known for battery drain. Apple support and the cell-phone store all said it was probably a hardware problem, and I had to send in my iphone/buy a new battery/...: costs: lots of euros.
But I could'nt believe it was a hardware problem, so keeped on looking for the problem.
Finally I found it. I deleted my exhange account and installed it again and : what a releive: all worked well again!!! Battery life back to 2 days, apps don't crass, email works properly.
All keeped on going very well during 3 weeks.
Than battery and email problems slowly started to appear again. Like last time, it gets slowly worse.
When I open the mail app, the little turning wheel icon next to the battery percentage is turning continously. When I delete the Echange account and only use my Gmail and Hotmail account, that little wheel icon only turns up for a few seconds, but with the Exchange account installed it stays there continuously.
I reinstalled Echange many times but it does not solve it. The strange thing is that when I go to Settings > Email > Accounts-Exchange > "delete this account" it starts but does not finish, the message saying that the account is being deleted stays on forever.
On this forum pages I saw one comparable problem description (https://discussions.apple.com/message/11852079?searchText=iphone%20memory%20drai n%20exchange#11852079). In their case the problem was the Exchange server. But my collegues with iphones do not have the same problem and also: how could it be the cause if it worked well for 1 year, and lately for 3 weeks, and then suddenly start giving problems.
Anybody have a idea what I could do?
Many thanks in advance!

I too seem to be having a similar issue with my wifi on my new 3GS. I would notice that my wave bars are full and then would drop to half. Performance seems to be about the same, but this never happened in my home with my original iphone.
What works to fix the issue, is turn off the wifi in settings and then turn it right back on. Boom, back to full wave bars. However once I go out of range and then return, the problem seems to reappear.
I'm a bit stumped and may do the same with seeing the friends at the apple store.

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i was strubbeling with the same problem, but i found 'a' solution.
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11/6/09 06 Nov 15:16:26 iCal[291] WARNING: Failed to find TimeZone Identifier for Windows MeetingTimeZone: Casablanca
11/6/09 06 Nov 15:16:26 iCal[291] error = Error Domain=CalExchangeErrorDomain Code=-11 UserInfo=0x11a287ee0 "iCal can’t refresh events in the calendar “Calendar”."
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I will subscripe to this post for a while, so if you need some help; Post it!
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Message was edited by: Ronald Veenbrink

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