After about a minute of watching any youtube video on either Chrome or Firefox the computer becomes completely unresponsive, screen is stuck, audio is looping the last second, the computer does not even register headphones being plugged into the 3.5mm jack. This is a problem that seems to have come out of the blue as I have not made any hardware or software changes, the only things the machine was used was general internet browsing, and watching online and locally stored videos. The freeze only seems to go away if I hard shutdown the computer, and persists after several reboots.
The problem only seems to affect youtube, VLC and other sites like twitch work fine.

Output of neofetch:

            .-/+oossssoo+/-.               barba@lenovo 

        `:+ssssssssssssssssss+:`           ------------- 

      -+ssssssssssssssssssyyssss+-         OS: Ubuntu 20.04.2 LTS x86_64 

    .ossssssssssssssssssdMMMNysssso.       Host: 81LK IdeaPad L340-15IRH Gaming 

   /ssssssssssshdmmNNmmyNMMMMhssssss/      Kernel: 5.11.0-25-generic 

  +ssssssssshmydMMMMMMMNddddyssssssss+     Uptime: 12 mins 

 /sssssssshNMMMyhhyyyyhmNMMMNhssssssss/    Packages: 2289 (dpkg), 6 (snap) 

.ssssssssdMMMNhsssssssssshNMMMdssssssss.   Shell: bash 5.0.17 

+sssshhhyNMMNyssssssssssssyNMMMysssssss+   Resolution: 1920x1080 

ossyNMMMNyMMhsssssssssssssshmmmhssssssso   DE: GNOME 

ossyNMMMNyMMhsssssssssssssshmmmhssssssso   WM: Mutter 

+sssshhhyNMMNyssssssssssssyNMMMysssssss+   WM Theme: Adwaita 

.ssssssssdMMMNhsssssssssshNMMMdssssssss.   Theme: Adwaita-dark [GTK2/3] 

 /sssssssshNMMMyhhyyyyhdNMMMNhssssssss/    Icons: Yaru [GTK2/3] 

  +sssssssssdmydMMMMMMMMddddyssssssss+     Terminal: gnome-terminal 

   /ssssssssssshdmNNNNmyNMMMMhssssss/      CPU: Intel i7-9750H (12) @ 2.600GHz 

    .ossssssssssssssssssdMMMNysssso.       GPU: Intel UHD Graphics 630 

      -+sssssssssssssssssyyyssss+-         GPU: NVIDIA GeForce GTX 1650 Mobile  

        `:+ssssssssssssssssss+:`           Memory: 1283MiB / 7835MiB 

            .-/+oossssoo+/-.

Attempted fixes and diagnostics:

• running the browser from a terminal shows no error codes prior to the freeze


• updating to the latest software using sudo apt upgrade


• hardware usage graphs and temperatures all look normal until freeze (as reported by System monitor and sensors)


• increasing swap file size to 4G and increasing vm.swappiness to 60 (this fix only seems to delay the problem,but it still exists)

output of free -h, sysctl vm.swappiness & swapon -s as suggested by @heynnema:

              total        used        free      shared  buff/cache   available

Mem:          7,7Gi       1,2Gi       5,5Gi        29Mi       964Mi       6,2Gi

Swap:         472Mi          0B       472Mi

vm.swappiness = 10

Filename                Type        Size    Used    Priority

/swapfile               file        483896  0       -2

• output of top at the moment of freeze
  I am using firefox to browse the web, but I have also tested Chrome and the problem persists.


• The nVidia driver was installed manually as Software & Updates wasn't downloading working drivers for whatever reason. The specific version is 460.91.03, as shown by nvidia-smi


• Output of sudo dmidecode -s bios-version: BGCN33WW


• Using the intel gpu does not help, in fact it is easier to cause the bug when using it


• NEW output of free -h:

              total        used        free      shared  buff/cache   available

Mem:          7,7Gi       1,2Gi       5,3Gi       157Mi       1,1Gi       6,0Gi

Swap:         4,0Gi          0B       4,0Gi

• NEW output of sysctl vm.swappiness:

vm.swappiness = 60

• NEW output of swapon -s:

Filename                Type        Size    Used    Priority

/swapfile               file        4194300 0       -2

• output of grep -i swap /etc/fstab:

 /swapfile  none  swap  sw  0  0