Can you confirm the InDesign version you are using? Is it 2018.1 or 2018?
I assume the path to which you are trying to export the PNG is /Volumes/Shares/011 Changed Information/002 Changed Information/00617 Changed Information/Changed/ ?
Is this drive mounted via SMB?
Is it a NAS server?James commented
Having the same issue. Export JPEG works fine onto desktop but not to network drive. Using Illustrator CC