So I was trying to take a quick backup of an Exchange store to a network share using NTBackup on a Win2k3 Server – yes SP2, fully updated and I kept getting the error “the network disk drive has stopped responding” after ~5 seconds and writes about 10MB of starting the job.  The share is still there, I can create a new text document, all is good, no network disconnects, nothing – just NTBackup refuses to run the full job.

The fix?  Close and restart NTBackup.  Djeez….