We have a new Heller 1809 EXL reflow oven and when we run MELF's or Aluminum Electrolytic Capacitors through the oven they are being blown off the pads. I have verified that the placement is good before reflow. I verified that they are pushed down into the paste. I also verified that the reflow profile was correct. I ran boards through the oven with the hood open 2 inches so I could watch the boards travel through but whenever I do this all the parts stay on the pads. There are no height clearance issues. We have run the same boards with the same parts for years on an older oven with no problems. Has anyone else had this problem? Any solutions?