Time Machine loosing track of backup share

I have a client that os 10.5.4 server running in basic mode. The clients are bound to the server using the Directory Utility. Every so often the clients start getting failures from Time machine. Now if you go to the Time Machine Preferences and click change disk, the same share that it was trying to connect to before shows up again and if you select it things work well again for a time. Then at some point the client forgets that share actually works and it has to be reset.
Anyone else run across this or have any thoughts?

This has been driving me nuts for a month now. Seems to only happen to laptop users after they have connected to another network, but once they are back on the LAN, the backup status still says delayed and you have to choose the disk again.
But not all the laptop users... no real consistency to it.
I'll try deleting the root level plist file on a couple users that seem to have the issue frequently and see if their is an improvement.
Any pointers would be appreciated

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