My iPhone 4 no longer syncs with iTunes 11 - "your iPhone disconnected"

Since I upgraded, I really struggle to sync my iPhone on my iMac running Mountain Lion (fully up to date) by USB.
It keeps saying that the iPhone disconnected.
I have tried different cables and I have restarted iTunes and the iPhone. It works once or twice after a reboot.
Anything else I can try please?
Thanks.

Found this in another discussion thread
Damon M.
This helped meRe: "iPhone disconnected" error in iTunes
Feb 14, 2008 2:09 AM (in response to GregM)
One thing that could cause this error message is corrupted data on the iphone or computer. Close itunes and disconnect the iphone.
Now open isync in the applications folder.
Once isync is open, open the isync preferences.
Click the button to reset sync history.
Once sync history is reset, quit isync and open itunes.
Open the itunes preferences and go to the syncing tab.
Check the box to disable automatic syncing for all ipods and iphones.
Connect the iphone and go to the info tab.
Go to the bottom of the info tab and check the box to replace all contact data on the iphone with what is in the computer.
Now click apply on the bottom right corner of itunes. If this does not work, open address book and create a new group.
Add 5 - 10 contacts to that group.
Now go into itunes with the iphone connected and set the iphone to only sync to that particular group.
if the iphone syncs ok, add some more contacts and sync again.
If the iphone does not sync, remove some of the contacts and sync again.
Keep going through this process until you narrow down which contacts are causing the problem. Hope this helps.

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