If the customer saves through a network, that could cause the issue. It is better to save to a harddisk.
As Jacob said, these are more generic networking issues. Without specific details it will be hard to advise, but look into server-side indexing services and network timeouts. Turn them off/ set them to refresh more often and see if it helps.
thank you very much.
you have guided me where it should be the issue.
For my part you are welcome, jusasil.