Ubuntu 18.04 - Harddisk goes into read-only mode repeatedly

My Dell laptop is new, purchased some 4 months back.
It had Ubuntu 18.04 preinstalled.

It goes into read-only mode repeatedly.
Code:$ df -i
Filesystem Inodes IUsed IFree IUse% Mounted on
udev 997454 547 996907 1% /dev
tmpfs 1005395 1087 1004308 1% /run
/dev/sda3 60669952 1088553 59581399 2% /
tmpfs 1005395 121 1005274 1% /dev/shm
tmpfs 1005395 5 1005390 1% /run/lock
tmpfs 1005395 18 1005377 1% /sys/fs/cgroup
/dev/loop3 12867 12867 0 100% /snap/core/10583
/dev/loop2 12921 12921 0 100% /snap/core/10823
/dev/loop4 1597 1597 0 100% /snap/gnome-characters/96
/dev/loop5 1271 1271 0 100% /snap/gnome-calculator/170
/dev/loop6 27651 27651 0 100% /snap/gnome-3-26-1604/64
/dev/loop7 26292 26292 0 100% /snap/gtk-common-themes/3
/dev/loop0 10809 10809 0 100% /snap/core18/1944
/dev/loop8 401 401 0 100% /snap/gnome-logs/103
/dev/loop14 355 355 0 100% /snap/gnome-logs/100
/dev/loop1 872 872 0 100% /snap/gnome-system-monitor/157
/dev/loop11 63978 63978 0 100% /snap/gtk-common-themes/1514
/dev/loop13 784 784 0 100% /snap/gnome-system-monitor/148
/dev/loop12 27624 27624 0 100% /snap/gnome-3-26-1604/100
/dev/loop15 18508 18508 0 100% /snap/gnome-3-34-1804/66
/dev/loop16 230 230 0 100% /snap/gnome-characters/570
/dev/loop17 18513 18513 0 100% /snap/gnome-3-34-1804/60
/dev/loop18 1384 1384 0 100% /snap/gnome-calculator/826
/dev/loop10 42523 42523 0 100% /snap/postman/132
/dev/loop9 42516 42516 0 100% /snap/postman/133
/dev/loop19 10817 10817 0 100% /snap/core18/1988
/dev/sda1 0 0 0 - /boot/efi
tmpfs 1005395 25 1005370 1% /run/user/120
tmpfs 1005395 41 1005354 1% /run/user/1001What more info should I present here?