IPhone locks up during the backup stage of syncing

Something from my MacBook Pro is not allowing my iPhone to backup properly during a "Sync"!
I'm on my 3rd iPhone and the same problem keeps cropping up. I sync my contacts, calendars, bookmarks, email accounts and photos and it all goes fine. However, If I disconnect the iPhone after the initial sync and reconnect it, the iPhone will FREEZE/Lockup during the Backup phase of any subsequent sync. I have two iPhones one for personal and one for work. I hadn't sync'd the work one for a while and just tried it (it was still on 1.1.1, which I left it at) and the same thing happened. Now the work iPhone won't backup either without Freezing. If I just plug in my iPhone and have auto syncing disabled. I can make a change to one of my settings for example uncheck or recheck a calendar and the sync goes fine when I click the Apply button. However, if I click the Sync button (which does a backup first), the iPhone will freeze every time.
I have tried a restore (more than once and setup as a new phone) and all is fine until I put my data back on. What could be in my contacts, photos, calendars, email accounts or bookmarks that could be causing this? Other than freezing during backup, everything else works. I also sync my media (music, videos, ringtones, podcasts) with an iMac G5 and it won't backup the iPhone either. The problem happens after a restore/setup as new and first sync even before I put media back on the iPhone from the iMac, so it's not the media. It's something from my MacBook Pro that's going onto the iPhone and not being able to be read back in during the Backup.
My setup is a MacBook Pro 15" 2.33GHz, Mac OS X 10.5.1, iTunes 7.6
iPhone 1.1.3 AND iPhone 1.1.1
IPhone connected directly to the USB 2 port on the MBP AND directly to the USB port on the iMac G5 (different cables). No hubs.
985 contacts
4 email accounts (all IMAP)
687 photos
countless bookmarks
about 6 iCals
Here's the console log:
1/21/08 11:31:00 PM 0x0-0x202202.com.apple.iTunes8364 Could not query daemon type
1/21/08 11:31:00 PM 0x0-0x202202.com.apple.iTunes8364 2008-01-21 23:31:00.193|AppleMobileBackup|13496:2953388032|SocketStreamHandler.c:_SocketLo gCallback| ERROR: SocketRecv (data): return of 0 bytes
1/21/08 11:31:00 PM 0x0-0x202202.com.apple.iTunes8364 2008-01-21 23:31:00.240|AppleMobileBackup|13496:2953388032|StreamHandler.c:_ReadFunc| ERROR: Error reading data: Can't read data
1/21/08 11:31:00 PM 0x0-0x202202.com.apple.iTunes8364 2008-01-21 23:31:00.241|AppleMobileBackup|13496:2953388032|DeviceLinkConnection.c:_DLHandl erThreadMessagePortCallback| ERROR: Could not receive message: '(null)'
1/21/08 11:31:00 PM 0x0-0x202202.com.apple.iTunes8364 2008-01-21 23:31:00.243|AppleMobileBackup|13496:2688802656|DeviceLinkConnection.c:_DLMainT hreadMessagePortCallback| ERROR: Error creating components from read data: 'NULL data returned from read'
1/21/08 11:31:00 PM 0x0-0x202202.com.apple.iTunes8364 Created child to sync device with pid 13504...
1/21/08 11:31:04 PM 0x0-0x202202.com.apple.iTunes8364 2008-01-21 23:31:04.449|AppleMobileSync|13504:2688802656|iPodSync.m:_getDeviceForTarget| ERROR: Could not find an attached device with the id ade92de298374f8e3a3d80cc369bd3a6b862d055
1/21/08 11:31:04 PM 0x0-0x202202.com.apple.iTunes8364 2008-01-21 23:31:04.507|AppleMobileSync|13504:2688802656|iPodSync.m:_ConnectAndSync| ERROR: Can't get device object for target id ade92de298374f8e3a3d80cc369bd3a6b862d055 (-1)
1/21/08 11:31:06 PM 0x0-0x202202.com.apple.iTunes8364 Sending final status from child helper tool back to parent...
1/21/08 11:31:06 PM com.apple.usbmuxd4306 usbmuxd4306: HandleUSBMuxCommand Client 0x104970 requesting attach to 0xa:32498 failed, no such device
1/21/08 11:31:06 PM 0x0-0x202202.com.apple.iTunes8364 Could not connect to lockdown port
1/21/08 11:31:07 PM com.apple.usbmuxd4306 usbmuxd4306: HandleUSBMuxCommand Client 0x104970 requesting attach to 0xa:32498 failed, no such device
1/21/08 11:31:07 PM 0x0-0x202202.com.apple.iTunes8364 Could not connect to lockdown port

Try restoring one of the iphones on you imac.
Once the iphone is restored and shows back up in itunes, do not restore from back up.
This would put any corrupt data back on the iphone.
Set the iphone up as a new iphone, but do not allow to auto sync everything.
First set iphone to only sync music and sync it a few times to see if issue persists.
If issue does not persist, move to videos and do the same thing.
Keep moving through the content that you like to sync on your imac, one group at a time to see if the back-up issue reoccurs.
If the iphone backs up and syncs fine on the imac, now move to the macbook.
On the macbook, try syncing contacts first.
Try syncing a few times to see if backup issue reoccurs.
If everything goes fine with contacts, move to bookmarks then to email.
Leave calendars to the last.
If bookmarks and email sync fine then start syncing calendars, but do not sync all calendars.
Start with just one calendar and keep adding another one until the issue reoccurs.
Once the issue reoccurs, you know that the last thing you synced with is causing the issue.
The issue might not be with just one item, so if it happens, un sync the last item and skip over to see if the issue occurs again.
Hope this helps.

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