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Redirected folders failing strangely.

Hello, I've got a problem that's driving me a little nuts.  We've been troubleshooting a while:

I have a single user in a 30+ user environment with this issue.  
This is a desktop computer, always on, NIC has sleep disabled.
There is only one network adapter.
Over the course of an hour a ping to the domain controller and fileserver (run to each separately) get well below 5% packet loss.
Packet loss does not line up with the time of the issue.

The Desktop folder is redirected, as are My Documents, My Pictures, My Music etc.

Periodically (no regular schedule, we've recorded it happening first thing in the morning, in the middle of the day, or while the user is actively working) the redirected desktop folder goes offline, and all other redirected folders are also offline.

The icons go to the expected washed-out appearance.

The user can open the desktop folder in explorer, select a file and click the "Work Online" button which fixes the issue until the next time.

HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\NetCache\SilentForcedAutoRecconect = 1
HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\CSC\Parameters\FormatDatabase = 1

Both resolved it for a day or two, but problem comes back.  

Normally I would shrug and simply recreate the user account to sidestep this, but there is 3rd party licensed software that makes that terribly messy in this case.

Anyone have ideas?
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If not mistaken, windows 7 sync center has exhibited such issue. on a LAN you should not have packet loss. Check whether it might be an issue with the network path. I.e. Take a system that does not manifest such issues, and switch the workstations, or switch the switch port between two systems. If the issue follows the switch, you'll know that it is an issue with the switch, otherwise it is an issue with the workstation or the wiring path.
if the issue with switching workstations does not follow the workstation you'd know the issue is with the wiring.
Replace the wire from workstation to the wall.
There are tools to test the wiring to make sure there is no interference .....
Depending on the equipment along the way .....
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Thanks Arnold,  I'm pretty confident it's not a physical issue, or even a networking issue.  

The issue followed the user to an entirely different machine yesterday afternoon, and we got our first report of another user having the issue.  The server storing the profiles is a VM and the machine the newly hit user was using is also a vm.  On the same host.
Sorry, one more thing, I'll check to see if the sync center has any useful logs, thank you.  I had checked eventviewer but hadn't dug too much into Sync center
The problem is clearly the network issues, as offline folders doesn't like regular drops in connectivity, particularly when a user has a lot of offline files. It is designed to react to drops by going into offline mode so is doing exactly what it is meant to.

The only SOLUTION is to sort the network issues.

There is a potential workaround but it works by stopping Sync centre doing what it is meant to:
net config server /autodisconnect:-1
If you run that on their machine it should stop Offline folders going offline so easily, but this is clearly achieved by overriding the intended behaviour.

I believe this command is lost after a reboot so may need re-running or adding to a script, but I strongly recommend logging a new question for help with the network issues as that is the root cause.
Thanks Steve,

I had also assumed network initially, but there's no physical connectivity issue I can spot and the latency on the connection is well within what I would expect, which is why I moved on to looking at the account.  I'll try the net config and see how it goes.

Is there a way to prevent a system from reporting a slow link incorrectly?
Is there a way to prevent a system from reporting a slow link incorrectly?
Not sure I agree as it sounds like its working correctly to me. Any notable packet loss suggests it isn't a stable connection and Offline files will go offline by design to protect file integrity.
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Changed caching on the share and the problem disappeared.  Thank you Arnold.