50MRxSmb{Delayed Write Failed} Windows was unable to save all the data for the file \Device\LanmanRedirector. The data has been lost. This error may be caused by a failure of your computer hardware or network connection. Please try to save this file elsewhere.
This error may either occur if your hardware is defect (check HD, cabling etc.) or if you are having network troubles.
We have seen this error also in combination with using VPN. In my case I got the error right after disconnecting from the VPN (I had just saved some information prior to disconnecting), implying that Windows continued to write to the network location in the background when I disconnected from the VPN.
If you are using Visual Source Safe over a VPN then see the second additional link.