Intermittent iphone activesync calendar/mail issues

We are experiencing intermittent activesync calendar/email issues that are causing many of our iPhone users to miss meetings and have major trouble scheduling events from the iPhone. The main problem is that most of the time everything works perfectly until suddenly you realize that you missed a meeting or that your email is suddenly out of sync and you have no idea how long it has be like that.
I have found several band aid "solutions" to temporarily resolve the issues:
http://blog.fosketts.net/2008/07/10/how-to-set-up-iphone-exchange-activesync/
http://blog.hltechsolutions.com/2008/07/iphone-activesync-calendar_24.html
We are using iPhone Firmware 3.0 and higher on all iPhones on a Exch 2007 server
We need a really solution for this ASAP

I am on version 3.1.2 and am having many problems with ActiveSync. It often says connection to server cannot be established and prompts me for my password multiple times a day. I have checked with other iPhone users in the organization and many do not have problems. I have tried changing my password, deleting the ActiveSync profile and recreating, and restoring the iPhone. I am getting quite frustrated as are my IT peers as they have to unlock my Windows account every few hours. I need help please!
This behavior seems to have started when I upgraded to 3.1.2. Before that I never had any problems.

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