Event ID - 50

Event Id50
SourceMRxSmb
Description{Delayed Write Failed} Windows was unable to save all the data for the file %1. 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.
Event InformationExplanation :
Windows delayed transferring some data to the server and the network connection was lost before that data could be transferred. As a result, the data may be lost and the file to which it was being transferred may be corrupted.

User Action :
Restore the network connection, and then check the validity of the file to which data was being transferred. If the file is not damaged, try saving it to another location. If you have a backup and data is lost or the file is corrupted, replace the file with the backup. If an important file was damaged and you have no backup, it might be necessary to create the file again.
Reference Links Lost Delayed-Write Data" Error Message Under Extreme File System Stress

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