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.

Or stick with sshfs since it works!

Yeah, fstab but with systemd handling the mounts which works way better than ... however that worked before:

# SSHFS from varangian
drew@192.168.1.70:/mnt/big /mnt/big fuse.sshfs noauto,x-systemd.automount,_netdev,user,idmap=user,follow_symlinks,identityfile=/home/drew/.ssh/id_rsa,allow_other,uid=1000,gid=1000 0 0

 

NFS is way quicker, and setup isn't too hard between unixy os (linux, mac/bsd). A bit less automagic than SAMBA.

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.