i have the same problem, however mine is happening on Packages or Applications
The task sequence manager could not successfully complete execution of the task sequence. A failure exit code of 16389 was returned. The operating system reported error 53: The network path was not found
"The task sequence manager could not successfully complete execution of the task sequence. A failure exit code of 16389 was returned" is consistent
"The operating system reported error 53: The network path was not found" this can be a different error
i have 2 failures out of 20 using the same task sequence, one is on MS Office and one which is just a cmd line to add a user to local admin group, so nothing fancy going on