Plutonium

An access violation in programming refers to an attempt to access a memory location in a way that is not allowed or permitted by the system. It is a type of error that occurs when a program tries to read from, write to, or execute code in a memory address that it doesn't have the appropriate permissions for.

That is what is happening with your .exe

Yours is specifically trying to reference a memory address here:
mov dword ptr [ebx],eax ds:002b:c273ee4c=????????

It can't execute this line of code because the .exe is lacking permission to do so.

You could try this:
go to C:\Users\You\AppData\Local\Plutonium

delete the entire Plutonium folder and then run plutonium.exe so it all downloads again. Remember your login.

If that didn't work, it might be your firewall. When a firewall is triggered by an app, the firewall immediately terminates it. It gives no explanation why, just terminates the app. That's how the Windows firewall is.

In this case, you could try this:
Type "firewall and network protection" in the windows search bar and open it.
Select "allow an app through the firewall".
Scroll down until you see "plutonium-bootstrapper-win32.exe".
Select "change settings".
Select "plutonium-bootstrapper-win32.exe" and tick both boxes.
Press "Ok".

ZirFox80s ActiveSlayer this is an odd question but do you happen to scroll your mousewheel aggressively before this error happens?

ZirFox80s Thank you for this video! It's interesting how the game appears to be functioning normally and having no problems and then something happens and crashes you out.

Try going back into that lobby or custom game (however you set it up). Go to that specific area in Nuketown and try standing exactly where you were and aiming where you did when that crash happened. See if you can repeat that same crash from doing exactly what happened on the video.

ZirFox80s The game closing without telling you the lost reliable commands error is probably something else but would it be possible for you to go into the game and play as you normally would until the lost reliable commands error happens again and try to remember exactly what happened or what you did right before it?

For example, did you squeeze all the buttons on your controller, did you spam-click or shake the mouse so the wire went all weird, did you slam the mouse or hit the controller, did you spin the mouse wheel up and down in a fit of rage? xD It sounds silly but I've had a look online and found some interesting posts regarding errors related to commands sending players back to the main menu.

Can you try unplugging your mouse, keyboard, headset, and any other peripheral devices and only playing with the controller connected to the computer? You'll have to unplug your mouse when you pick a server to join.

Peripheral devices look like this:

It happened right when I said "bet you didn't expect that erekt" because I got player "erekt" with a tomahawk when he tried to do the jump technique to get me behind my riot shield. It must've got triggered by mistake somehow. Can someone tag a nameless noobs admin to help me?

ZirFox80s This is fascinating. I'll have to post this solution somewhere so Plutonium doesn't lose it! Thank you for trying so hard to find the cause.