What's with the Red Alerts (missions)? Many times I hit the red button to warp to the site of the Borg infestation and the battlefield is empty. It's not like I got there late and the battle just finished, because it also happens when the alert button first appears. I haven't tested it in all sectors, but I know it has happened in at least several different ones including the new Tau Dewa Block.
It's happened before but seems to be worse now since S7 began.