NAS no longer mounting at boot

[Russell Gadd <russ.mail.lists@gmail.com>]

I have this in /etc/fstab
//nasbox/dataNAS /mnt/dataNAS cifs
rw,user,exec,iocharset=utf8,user=xyz,password=xxx,uid=1000,gid=1000

Up to recently it used to mount at boot time but doesn't any more. I
assume some update changed things. Unfortunately I only use this
system once or twice a week and I noticed it a week or so ago, so I
can't tell you exactly when this behaviour started. Can't see anything
obvious in dmesg (but then I'm not particularly clued up on Debian).

If I use "mount -a" at a root terminal the NAS mounts ok, so it's not
a show-stopper but is a bit annoying to do this manually at each boot.

Any clues would be appreciated.