This happened today to me while playing on Liberation Peak. When I fired the last round of a grenade launcher and the game automatically switched back to my rifle, the camera detached from my character.
At first it looked as if it switched to a third-person perspective, but when I started moving I realized that the camera was stuck in its current position and would not move with my player model (it would continue pointing at it though). I have only seen this bug once and have no idea what might have caused it or how to reproduce it.
It happened again in another round, this time completely out of the blue, so I think the weapon switch when it happened the first time was just coincidence. As you can see, being downed and getting revived doesn't fix it. Actually dying and respawning does however.
