I haven't found anything.... I tried it myself and the filesystem stayed mounted, so maybe I have a different version of something installed ... or something. My best guess is that wicked is trying to be clever when the network interface goes down - you are using wicked I assume (ps axgu | grep wicked). It might be possible to configure tumbleweed to use network-manager instead. Does grep -ri nfs /etc/sysconfig/network grep -ri mount /etc/sysconfig/network show anything interesting? That is where a wicked config file would be. If that doesn't show anything, could you systemd-analyze set-log-level 7 then suspend, then journalctl -p 7 -xb and collect any systemd log messages during syspend/resume. Maybe that will shed some light.