This happened to me my first game today, had to restart the game and then try reconnecting like 2 or 3 more times then it finally stayed in the game. Luckily they kept the game paused 'til I loaded in.
I think you can either turn the shader cache off and restart, the renable it and restart again, or you can go to %appdata%\local\nvidia\DXcache\ and delete the stuff in there, deadlock's shader file should be ~260-270mb in size
https://forums.playdeadlock.com/threads/keyboard-frequently-stops-functioning-in-game-only-especially-after-dying.84965/
perhaps related, I experience this bug but nothing like what you show tbh