Lightroom 5 can't write metadata to DNG files

I have converted a large number of Canon and Nikon raw files to DNG using Adobe DNG Converter (version 8.2.0.94). 
Using Lightroom 5.2 I wanted to change metadata in these master DNG files.  I import the files into a catalog, select all, modify the metadata, then invoke the Metadata->Save Metadata to Files...  For many (but not all) of the files I get the following message:
"Could not write metadata.  Unknown file formats."
The DNG files reside on a Synology NAS server.  If I copy them to a local disk I do not get the above error.  But I would like to make metadata changes to the files on the NAS.
I do not have problems importing or viewing DNG files from the NAS.  Why does LR 5 have problems writing DNG metadata to the NAS?  How can I fix this?

Thanks for replying.
The problem is definitely not one of permissions. I am accessing the NAS from an admin account with full permissions to read/write the files and directories.
I'm inclined to believe it's the second cause you propose -- network protocol causing data corruption. 
It seems to be specific to writing metadata to large files such as DNG or TIFF.  I don't get errors writing to JPEG.  And it is inconsistent -- sometimes retrying fixes it.  And, oddly, sometimes I even get the error "photos have read-only access" when it's clear the permissions are OK.
On the other hand I have had no problems copying thousands of DNGs to/from the NAS -- no errors and no corruption.  So the issue seems to be an interaction between the NAS and LR when LR is updating the metadata on an existing file and the file is large.

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