It happened again and I have output journalctl -b and findmnt --list.
journalctl -b is way too big too paste here unless you really want to over 2000 lines - do you have an email address I can send the txt file to you ?
Here is the contents of findmnt --list:
TARGET SOURCE FSTYPE OPTIONS
/sys sysfs sysfs rw,nosuid,nodev,noexec,relatime
/proc proc proc rw,nosuid,nodev,noexec,relatime
/dev devtmpfs devtmpfs rw,nosuid,size=4026304k,nr_inodes=1006576,mode=755
/sys/kernel/security securityfs securityfs rw,nosuid,nodev,noexec,relatime
/dev/shm tmpfs tmpfs rw,nosuid,nodev
/dev/pts devpts devpts rw,nosuid,noexec,relatime,gid=5,mode=620,ptmxmode=000
/run tmpfs tmpfs rw,nosuid,nodev,mode=755
/sys/fs/cgroup tmpfs tmpfs ro,nosuid,nodev,noexec,mode=755
/sys/fs/cgroup/unified cgroup cgroup2 rw,nosuid,nodev,noexec,relatime
/sys/fs/cgroup/systemd cgroup cgroup rw,nosuid,nodev,noexec,relatime,xattr,name=systemd
/sys/fs/pstore pstore pstore rw,nosuid,nodev,noexec,relatime
/sys/fs/cgroup/memory cgroup cgroup rw,nosuid,nodev,noexec,relatime,memory
/sys/fs/cgroup/perf_event cgroup cgroup rw,nosuid,nodev,noexec,relatime,perf_event
/sys/fs/cgroup/hugetlb cgroup cgroup rw,nosuid,nodev,noexec,relatime,hugetlb
/sys/fs/cgroup/rdma cgroup cgroup rw,nosuid,nodev,noexec,relatime,rdma
/sys/fs/cgroup/freezer cgroup cgroup rw,nosuid,nodev,noexec,relatime,freezer
/sys/fs/cgroup/net_cls,net_prio cgroup cgroup rw,nosuid,nodev,noexec,relatime,net_cls,net_prio
/sys/fs/cgroup/cpu,cpuacct cgroup cgroup rw,nosuid,nodev,noexec,relatime,cpu,cpuacct
/sys/fs/cgroup/devices cgroup cgroup rw,nosuid,nodev,noexec,relatime,devices
/sys/fs/cgroup/cpuset cgroup cgroup rw,nosuid,nodev,noexec,relatime,cpuset
/sys/fs/cgroup/blkio cgroup cgroup rw,nosuid,nodev,noexec,relatime,blkio
/sys/fs/cgroup/pids cgroup cgroup rw,nosuid,nodev,noexec,relatime,pids
/ /dev/mapper/system-root[/@] btrfs rw,relatime,space_cache,subvolid=256,subvol=/@
/proc/sys/fs/binfmt_misc systemd-1 autofs rw,relatime,fd=30,pgrp=1,timeout=0,minproto=5,maxproto=5,direct,pipe_ino=16687
/dev/mqueue mqueue mqueue rw,relatime
/dev/hugepages hugetlbfs hugetlbfs rw,relatime,pagesize=2M
/sys/kernel/debug debugfs debugfs rw,relatime
/boot/grub2/x86_64-efi /dev/mapper/system-root[/@/boot/grub2/x86_64-efi] btrfs rw,relatime,space_cache,subvolid=264,subvol=/@/boot/grub2/x86_64-efi
/tmp /dev/mapper/system-root[/@/tmp] btrfs rw,relatime,space_cache,subvolid=260,subvol=/@/tmp
/opt /dev/mapper/system-root[/@/opt] btrfs rw,relatime,space_cache,subvolid=263,subvol=/@/opt
/srv /dev/mapper/system-root[/@/srv] btrfs rw,relatime,space_cache,subvolid=261,subvol=/@/srv
/boot/grub2/i386-pc /dev/mapper/system-root[/@/boot/grub2/i386-pc] btrfs rw,relatime,space_cache,subvolid=265,subvol=/@/boot/grub2/i386-pc
/var /dev/mapper/system-root[/@/var] btrfs rw,relatime,space_cache,subvolid=258,subvol=/@/var
/usr/local /dev/mapper/system-root[/@/usr/local] btrfs rw,relatime,space_cache,subvolid=259,subvol=/@/usr/local
/root /dev/mapper/system-root[/@/root] btrfs rw,relatime,space_cache,subvolid=262,subvol=/@/root
/snap/gtk2-common-themes/9 /dev/loop4 squashfs ro,nodev,relatime
/snap/vlc/1397 /dev/loop2 squashfs ro,nodev,relatime
/snap/blender/36 /dev/loop5 squashfs ro,nodev,relatime
/snap/chromium/1040 /dev/loop0 squashfs ro,nodev,relatime
/snap/obs-studio/888 /dev/loop3 squashfs ro,nodev,relatime
/snap/kdenlive/22 /dev/loop7 squashfs ro,nodev,relatime
/snap/dataexplore/11 /dev/loop6 squashfs ro,nodev,relatime
/snap/gtk-common-themes/1440 /dev/loop1 squashfs ro,nodev,relatime
/snap/telegram-desktop/1038 /dev/loop8 squashfs ro,nodev,relatime
/snap/audacity/599 /dev/loop11 squashfs ro,nodev,relatime
/snap/core18/1668 /dev/loop10 squashfs ro,nodev,relatime
/snap/core/8689 /dev/loop14 squashfs ro,nodev,relatime
/snap/gnome-3-28-1804/116 /dev/loop13 squashfs ro,nodev,relatime
/snap/firefox/323 /dev/loop15 squashfs ro,nodev,relatime
/snap/kde-frameworks-5-core18/32 /dev/loop18 squashfs ro,nodev,relatime
/snap/atom/247 /dev/loop9 squashfs ro,nodev,relatime
/snap/chromium/1043 /dev/loop16 squashfs ro,nodev,relatime
/snap/atom/248 /dev/loop12 squashfs ro,nodev,relatime
/snap/chromium-ffmpeg/15 /dev/loop17 squashfs ro,nodev,relatime
/home /dev/mapper/system-home xfs rw,relatime,attr2,inode64,logbufs=8,logbsize=32k,noquota
/sys/kernel/debug/tracing tracefs tracefs rw,relatime
/run/user/1000 tmpfs tmpfs rw,nosuid,nodev,relatime,size=807600k,mode=700,uid=1000,gid=100
/sys/fs/fuse/connections fusectl fusectl rw,relatime
/run/user/1000/doc /dev/fuse fuse rw,nosuid,nodev,relatime,user_id=1000,group_id=100
/run/snapd/ns tmpfs[/snapd/ns] tmpfs rw,nosuid,nodev,mode=755
/run/snapd/ns/firefox.mnt nsfs[mnt:[4026532668]] nsfs rw