fstab ssh mount eating network and CPU

I've recently bought a NAS (WD MyCloud) and coected it to my router. I'm able to see it on the network and coceting through SSH. I was also able to put an fstab entry to automount a folder in my computer. I transfered some files to it and everything was fine. Today, I notice that this mount is constantly using 5-10 MB/s of incoming bandwidth and 5% of CPU, even when I'm not using it (not reading, not even opening any folder of the mount point).

I am using Ubuntu 16.04

The fstab entry is :

NASUSER@NASHOSTNAME:/shares/Multimedia /data/Multimedia  fuse.sshfs _netdev,noauto,x-systemd.automount,users,idmap=user,port=XXXX,IdentityFile=/PATH/TO/IDENTITY/FILE,allow_other,recoect 0 0

The process that eats ressources is :

ssh -x -a -oClearAllForwardings=yes -oport=XXXX -oIdentityFile=/PATH/TO/IDENTITY/FILE -2 NASUSER@NASHOSTNAME

Some help would be very much appreciated. Thanks.