It's because he was internally fuming about the incoming messages on screen.

He does a lot of really unnecessary kiting but when the messages talk about trans rights and tell him he has no real friends and will die alone, you can see that he stops fighting and runs as far as he can from the boss. Then he stops and opens the chat box for a second - as if to try to respond, but he can't quick reply because the JFK/Israel message was the most recent - before the boss arrives and he gives up and returns to the fight.

It's also why the instant he lags he quits. You can see the connection catches up and he's still alive but no longer playing.

In other words, Musk's childishly named character died because his ego was absolutely tearing him apart. He couldn't think or focus when confronted by messages about how pathetic he was, and his failures as a father. He wanted the stream to end so badly that he was willing to blame his own product as the excuse.