I've actually seen quite a bit of odd/ill behavior with Windows (waking up cranky) in general if the My Documents folder is moved to a network drive (which also kills the start menu auto-search/indexing feature). This is due to Windows not always having the share access reopened completely before an application tries to get there.
If you browse to the network located My Documents folder, right click it, and select 'Always available offline'. It will enable the Client Side Cache (CSC) for all the files stored in the network location, and I suspect it may eliminate the errors.
Note: I've not tried using the above for this specific case, I'm only stating that it has resolved this type of behavior for me several times in the past.
If you have a large amount of data on the network drive, it will vary close to the same amount of space on your computer to cache it locally. So if you have a really large amount of data it would be prudent to only cache specific troublesome subfolders ... Instead of the entire My Documents parent folder.