Tell us about your networking environment.
Sorry forgot to mention.
Were working here with a simple domain network ( 10 - 12 users in the domain )
We have one file server, thats were the InDesign documents are saved.
And we got one email sever.
This is mainly a windows network, we got 2 macs connected. (where my macbook is 1 of the 2)
I connect with my macbook to the file server via smb://servername
Never had a problem with that, worked 100% fine for the last year.
And this problem doesnt occur with other files that are stored on the file server (Think of Photoshop documents and Illustrator documents)
So you see the problem on the wired network in your office from a Mac InDesign client to a Windows SMB server via SMB.
Try running "ping -s 1400 servername" in a Terminal.app and then hit ^C after you experience this problem and look at the packet statistics. netstat -ss output before and after the problem might also be interesting. Not sure how to get the SMB equivalent of nfsstat -c, which is really what you want.
Problems with the other Mac client?