tente adicionar _netdev
e remover noauto
da sua entrada /etc/fstab
.
Exemplo:
https://[mylink].stackstorage.com/remote.php/webdav/ /var/stack davfs user,_netdev,rw 0 0
A partir da página do manual :
_netdev
The filesystem resides on a device that requires network access (used to prevent
the system from attempting to mount these filesystems until the network has been
enabled on the system).
noauto - The filesystem will NOT be automatically mounted at startup, or when mount passed -a. You must explicitly mount the filesystem.