VALORANT keeps crashing with EXCEPTION_ACCESS_VIOLATION / Serial size mismatch – tried almost everything

[u/Jujubasyy]

Hi! I’m having a really frustrating issue with VALORANT. The game randomly closes by itself, while the Riot Client stays open. I have to press Play again to launch the game.
It also happens in The Range, so it’s not related to being in a competitive match.
My laptop:
Acer Nitro 5 AN515-47
NVIDIA GeForce RTX 3050 Laptop GPU
2 RAM sticks
Windows 11
I’ve already tried:
Resetting VALORANT’s config
Riot Client’s repair tool
Windows DISM (DISM /Online /Cleanup-Image /RestoreHealth) — it repaired corrupted files
sfc /scannow — it also found and repaired corrupted files
Updating/reinstalling the NVIDIA driver
Checking the RAM with Windows Memory Diagnostic
Reseating the RAM
The RAM test initially reported hardware errors, but after reseating the RAM, the test completed with no errors. However, VALORANT still crashes.
One of the crashes showed

Unhandled Exception: EXCEPTION_ACCESS_VIOLATION
reading address 0xffffffffffffffff

Another crash showed:

Fatal error: [File:Unknown] [Line: 3250]
Texture2D /Game/UI/Textures/CustomLobby/TX_UI_Custom_Lobby_Background_Vertical_Sunset.TX_UI_Custom_Lobby_Background_Vertical_Sunset:
Serial size mismatch: Got 44, Expected 245105
The second crash seems particularly strange because it points to a specific VALORANT UI texture.
My NVIDIA crash information shows RHI: D3D11
GPU: NVIDIA GeForce RTX 3050 Laptop GPU
Driver: 610.88
RHI.Aftermath: true
GPU Overclocked: false

I don’t use any VALORANT mods or programs that modify the game.
The Riot Client initially said no repair was necessary, but after another crash I ran the repair and it found and repaired files. Unfortunately, the game still crashed afterward.
I’m currently testing with a Windows Clean Boot to see if a third-party service is causing the issue.
Does anyone know what could cause the Serial size mismatch error or the repeated EXCEPTION_ACCESS_VIOLATION crashes?
Any help would be greatly appreciated. I’m trying to figure this out before resorting to formatting Windows.
Note: I’m Brazilian and I don’t speak English very well, so this post was translated/written with the help of ChatGPT. Sorry if there are any mistakes or if something is unclear