Access Error for robocopy

A lot of folders can be robocopy to another server recently. The following errors are logged. Any idea ?

Thx

2018/05/02 03:12:36 ERROR 64 (0x00000040) Scanning Source Directory Z:\Tsegxxxxx\
The specified network name is no longer available.


2018/05/02 03:12:36 ERROR 64 (0x00000040) Accessing Destination Directory D:\ARCH17\Tsegxxxx\
The specified network name is no longer available.
AXISHKAsked:
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Ayoub RouziCeo & CoFounderCommented:
To resolve this issue, contact Symantec to assist you with the SymantecEndpointProtection software or Symantec Antivirus software.
For more information about how to obtain support for these products, visit:
http://service1.symantec.com/SUPPORT/ent-security.nsf/docid/2007121216494948
Use one of the following methods:

Method 1: Update your copy of Symantec Endpoint Protection to the latest version available

Symantec has identified this as a known issue (bug) and they have published a an update to these programs to resolve this issue:

http://service1.symantec.com/SUPPORT/ent-security.nsf/docid/2007102613484948

Method 2:  Completely remove Symantec Endpoint Protection 11.0

Please follow Symantec documents or contact Symantec support to use this method. To contact Symantec visit one of the following Symantec Web sites:

  http://service1.symantec.com/SUPPORT/ent-security.nsf/docid/2007101615023748

 http://service1.symantec.com/support/ent-security.nsf/854fa02b4f5013678825731a007d06af/5db8e519e16d42f2882573290005aa1d?OpenDocument

Source: https://support.microsoft.com/en-us/help/961293/unable-to-access-shares-the-specified-network-name-is-no-longer-availa
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AXISHKAuthor Commented:
Symantec Endpoint is not installed on the server. Thx
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AXISHKAuthor Commented:
Here is the robocopy parameters that I use
  /copyall /E /Z /NP /nfl /ndl /r:0 /tee /MIR /XD "@Recycle" /xf "Thumbs.db" /Log+:$RobocopyLog
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Qlemo"Batchelor", Developer and EE Topic AdvisorCommented:
Are those errors random or occuring on exact the same point in the copy process?
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AXISHKAuthor Commented:
Occur at the same point...
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Qlemo"Batchelor", Developer and EE Topic AdvisorCommented:
Is D: a local drive or network share?
It looks like there is some overload situation causing the workstation client to give up on accessing anything ... Adding a delay between packets might help then (use /IPG:n with n in milliseconds).
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