This is fixed in the latest update it appears.
I will check again with the latest update.
The problem is that my gun is not pre-loaded with another round when using a light carrier.
They cannot be clicked
Happens at caches, too. I have to switch to nade launcher, tap F and I'm good to go.
Edit: only happens for Light Carrier
I played on a server for a while. During map voting, I tabbed my game down, and when I brought it back up, a message said something about the server shutting down. I pressed Enter, and I was back at the main menu. I could not click anything, and the keybindings did nothing. I had to Alt+F4 it.
After death, I spectated a teammate, who had an M870 I believe. When he reloaded, the animation did not stop, even as he fired the weapon. In 3rd person, the animations are correct. The animation fixes when the player switches weapons and presumably when you re-enter spectate.
Ping shouldn't really matter... what are your system specs?