"err = -43" when downloading app store updates

Question

Help,
I added a NAS a few months ago, and use that to store my iTunes library. Since then, whenever I have app store updates, I usually get ~50-75% rate of receiving an error message when auto-downloading updates. The process runs through, but many of the apps receive this error, and many other apps go through the entire downloading process, but iTunes still shows them as needing updates afterward, requiring another full download.
I'm fairly certain this has to do with my NAS, but am hoping someone can help me understand what settings/configuration could help to minimize the occurrence of this issue.

Answer 1

Try deleting the partial cached downloads in the iTunes media folder.
That error is outlined here -> iTunes: Advanced iTunes Store troubleshooting
"Error -50," "-5000," "8003," "8008," or "-42023"
These alerts occur due to timeouts or conflicts trying to write a file during download.
If you encounter this issue while accessing iTunes Store:
See iTunes 9: "One Moment Please" or "Error (-50)" message when accessing iTunes Store
If you encounter this issue while while downloading something from the iTunes Store:
Delete your iTunes Downloads folder, located in:
Mac OS X:
  ~/Music/iTunes/iTunes Media/Downloads   Note: "iTunes Media" may appear as "iTunes Music. Also, the tilde (~)  refers to your Home directory.
Windows  Vista:
  \Users\username\Music\iTunes\iTunes Media\Downloads\
Windows  7:
  \Users\username\My Music\iTunes\iTunes Media\Downloads\
Windows  XP:
  \Documents and Settings\username\My Documents\My  Music\iTunes\iTunes Media\Downloads\
After locating your iTunes Downloads folder:
Quit iTunes.
Delete the Downloads folder on your computer.
Open iTunes.
Choose Store > Check for Available Downloads.
Enter your account name and password.