Disk copying activity pauses then restarts

We have a SBS 2003 server that appears to be struggling to copy files. It runs quite quickly but then appears to pause.

The estimated time remaining for the procedure will increase steadily and then it removes the estimated remaining time. After a couple of minutes, the time reduces again as presumably the copy starts working. This cycle repeats until the copy is finished.

I've disabled the antivirus for that location and this had no effect.
I also wondered if it could be a disk or RAID fault but there's nothing apparent in the event log.

Any ideas?
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Haresh NikumbhSr. Tech leadCommented:
are you copying from network ?  have you check it out server it self ? copying from one volume to another?

if copying from one volume to another also gives same result then check it on safe mode..

if safe mode works then you need to try disabling third party services on the Server

how to disable third party services..

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Windows Server 2003

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