Sometimes when I respawn the "Respawning in ..." screen does not go away and I cannot move or do anything except bring up the menu.
I have run into this several times. I found that if you hit A to switch classes, change your class and then switch back, the game usually restarts. Sometimes you may have to do this a few times, but it has eventually worked for me each time. Just make sure you switch back to your original class before pressing B to back out so you don't loose any upgrades you may have gained since the start of the match. Eka is aware of this issue (mentioned it during a gaming session a few days ago) so I am sure the Uber Team will be working on it.