Contacts syncing then disappearing then resyncing on iPhone/iPad with Exchange Activesync 2010

Using iPhone 4S and iPad with 5.0.1 and Exchange 2010 activesync, user has about 1600 contacts, inbox is clear/empty. ISSUE: After migrating client to Windows 7 and Exchange 2010, contacts on devices sync slowly but rarely get to the total number of 1600. Gets to about 1000 contacts after 1hr of syncing, but sometimes resets after a few hundred contacts appearing. Randomly, the phone/ipad will stop syncing and all synced contacts disappear, then start resyncing again. Have set up this users login on another iPhone 4S with 5.0.1 and same issue occurs. Is not device dependent nor is the reset timer consistent so we don't believe it's a timeout issue - reset time is random. Prior to migration, user didn't experience this issue. We cleared the inbox to ensure large emails weren't causing a server timeout. Inbox and calendar appear synced. Have tried all combinations of push/fetch/# of mails etc, but sure it's not device or setup dependent. It seems something in the new server combination with 5.0.1 or perhaps a "bad" contact that the server encounters will cause the contact list "reset" and begin resyncing. Seems to be an isolated case in this enterprise server/space. On the iPads/iPhones, other contacts or mailboxes are synced, no local contacts on iTunes, and Cloud is turned entirely off. Have checked contacts for "large" contacts - total contact list folder is < 20MB due to some card images. Would appreciate any help or suggestions. Alan.

I have the same issue in my iPhone 4S (IOS 5.1.1). 3 others in my company have the same situation.
The problem started last Friday. I have not changed anything in my iPhone.
I tried turning off iCloud contacts sync, I tried recreate my Exchange account. I tried a complete reinstall.
After that I could do a full sync on Sunday.
On Monday I lost my contacts again and I could no longer do a full sync. I have 1200 contacts and I can not sync more than 400, the synchronization stops and all contacts disappear, then the resynchronization starts again.
Eduardo

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