It has just happened to me. I was walking around with a laptop out (which shouldnt be allowed). I put it back. Died. Went to call in my lightning strike... and got stuck in limbo. Shows im dead. Wont let me respawn. Ive hit every button. Chose different classes. My team capped a base, and it was ddestroyed - and I still wasnt back.
I finished out the match - dead.