Hello, I have programmed a depalletizing sequence using the wizard, the robot depalletize 4 pieces, basically robot take out 4 pieces and move them to another place, the first time it works perfectly, but when I put it in continuous cycle mode, it does once and when I start again for the second time, the robot crashes against the pile and jumps the security. Perhaps it is necessary to restart something, for that the sensor return to work? 
The robot is UR3 controller CB