I play Arma Reforger through GeForce NOW Ultimate via Steam.
When I join the modded multiplayer server "Conflict in Europe", I can enter the server and play normally for some time. The crash does not happen during mod downloading. It happens later during gameplay, usually after around 1 hour.
GeForce NOW then crashes/shuts down the session with error code 0x8004000B.
This started after the latest major Arma Reforger update. Before that update, I was able to play on the same modded servers through GeForce NOW without this issue.
I also tried another modded multiplayer server, and the situation was similar - after some time of gameplay, the session crashed with the same error.
Steps to reproduce:
Launch Arma Reforger on GeForce NOW Ultimate via Steam.
Open Multiplayer.
Join the server "Conflict in Europe".
After around 30 min/1 hour of gameplay, the game/session crashes with GeForce NOW error code 0x8004000B.