I have the same problem. Sometimes after reboot docker images, networks, containers are gone. Like docker just installed.
I have find out that on such boot some mounts are dissapired.
The boot without docker settings\entities:
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#mount
/dev/md9 on / type ext4 (rw,noatime,nodiratime,commit=60,data=writeback)
devtmpfs on /dev type devtmpfs (rw,relatime,size=1920556k,nr_inodes=480139,mode=755)
proc on /proc type proc (rw,relatime)
devpts on /dev/pts type devpts (rw,relatime,gid=5,mode=620,ptmxmode=666)
tmpfs on /dev/shm type tmpfs (rw,relatime,mode=777)
tmpfs on /tmp type tmpfs (rw,relatime)
tmpfs on /run type tmpfs (rw,nosuid,nodev,relatime,mode=755)
sysfs on /sys type sysfs (rw,relatime)
tmpfs on /opt/var type tmpfs (rw,relatime)
/dev/mapper/vg0-lv0 on /Volume1 type btrfs (rw,relatime,nodatasum,nodatacow,nobarrier,space_cache=v2,autodefrag,subvolid=5,subvol=/)
/dev/mapper/vg0-lv0 on /home type btrfs (rw,relatime,nodatasum,nodatacow,nobarrier,space_cache=v2,autodefrag,subvolid=259,subvol=/User)
cgroup on /sys/fs/cgroup type tmpfs (rw,relatime,mode=755)
cgroup on /sys/fs/cgroup/cpuset type cgroup (rw,relatime,cpuset)
cgroup on /sys/fs/cgroup/cpu type cgroup (rw,relatime,cpu)
cgroup on /sys/fs/cgroup/cpuacct type cgroup (rw,relatime,cpuacct)
cgroup on /sys/fs/cgroup/blkio type cgroup (rw,relatime,blkio)
cgroup on /sys/fs/cgroup/memory type cgroup (rw,relatime,memory)
cgroup on /sys/fs/cgroup/devices type cgroup (rw,relatime,devices)
cgroup on /sys/fs/cgroup/freezer type cgroup (rw,relatime,freezer)
cgroup on /sys/fs/cgroup/net_cls type cgroup (rw,relatime,net_cls)
cgroup on /sys/fs/cgroup/perf_event type cgroup (rw,relatime,perf_event)
cgroup on /sys/fs/cgroup/net_prio type cgroup (rw,relatime,net_prio)
cgroup on /sys/fs/cgroup/pids type cgroup (rw,relatime,pids)
cgroup on /sys/fs/cgroup/rdma type cgroup (rw,relatime,rdma)
On a boot with docker settings\entities, additional mounts are present:
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/dev/mapper/vg0-lv0 on /Volume1/DockerData/btrfs type btrfs (rw,relatime,nodatasum,nodatacow,nobarrier,space_cache=v2,autodefrag,subvolid=2299,subvol=/DockerData)
shm on /Volume1/DockerData/containers/e2ebf0a6ac4ebc180e66c7242bdb7a6d1f29f8eb7dfc66798eab9a03d35a687a/mounts/shm type tmpfs (rw,nosuid,nodev,noexec,relatime,size=65536k)
shm on /Volume1/DockerData/containers/cfd44d7f6334b5f5ddb43c38713d8e913873afa316f088ec24693c13552dbc96/mounts/shm type tmpfs (rw,nosuid,nodev,noexec,relatime,size=65536k)
nsfs on /run/docker/netns/e31ded2509f4 type nsfs (rw)
nsfs on /run/docker/netns/5f2397a94415 type nsfs (rw)
shm on /Volume1/DockerData/containers/4a5f3f48339acf40c27e148a7875b92f8674066056ee40100abbac23d29d207b/mounts/shm type tmpfs (rw,nosuid,nodev,noexec,relatime,size=65536k)
nsfs on /run/docker/netns/b6f2d034e81e type nsfs (rw)