IMacs lose connection to windows server

We have recently moved over to macs in the office, so previously we had 3 PC's all connected to a WD Sentinel server where we access large files between us rather than keeping information on the computer.
We have slowly been moving over to iMacs but the problem is these lose connection to the server, so for example if we are transferring large image files, they will just stop, or if accessing catelogs on Lightroom that are stored on the server, we have to 'find missing folders'. This can happen every hour. The connection is also overall slower (for example loading previews/thumbnails) compared to the PC's, which arent even spec'd as high as the iMacs. It also has nothing to do with it going to sleep, it can happen in the middle of working.
All iMacs are connected via ethernet as the PC's were. The WD is meant to be compatible with macs and pc's, which is why we bought it.
Ideally I want to avoid having to splash out money on a Time Capsule and connect them all via thunderbolt, but wanted to check if this is my only option?

I would guess the user's Windows account is corrupted. Since Error -36 is a read/write error, it could occur if the user's server account record is damaged. Since you can use this Mac to logon to other accounts, the Mac is probably fine. Since other Macs can still logon, the Windows server 2003 is fine. This points toward a corrupted account.
I've experienced this phenomenon with Windows accounts and Windows PCs.
A test would be to logon to this user's account from another machine on the network, either Mac or PC. Failure from another machine would point to corruption of that account on the Windows 2003 server. If corrupt, it will need to be deleted and re-created. Backup any server data for this account, since deleting the account will destroy any server data for this account.

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Message was edited by: Halmat

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