I believe every kickoff return in the preseason.
If you take a knee in the end zone, ball goes out to the 25. From memory, Janis has returned one past the 25 this preseason and there were 2 holding penalties on the Packers called during it. So net yardage, if a ball is kicked into the endzone and you decide to run it out and you get tackled before the 25, is really a loss of yards. He also had the muffed kick at the goal line against the Eagles. For too long now, Janis appears to make bad decisions on when to return it and when to just kneel. Also, when he does return a ball, it's nothing special, it appears he just runs it right up the middle of the field, hoping someone creates a hole, and gets tackled short of the 25.