How are you mounting stuff? Via fstab?
I remember years ago having various issues with network shares dropping out mounted using fstab and having to do "mount -a" far too often. Then I moved to autofs and it fixed all issues. If you're already using it then no idea, if you're not it might be worth playing with.
Setup was fine, it just needed to be restarted every few days which was a pain. Couldn't be arsed to dig into it since it was overkill for what I needed anyway.