If you have an electronic stone trap, I have had problems on my TR 96 also. In high yielding corn with the sensitivity on low it still wants to open up. I've found that the control box where you set the sensitivity goes bad because it is mounted directly to the side of the feeder house and it gets vibrated to death. Try a new box (matched set with the sensor in the feeder floor) which is very expensive but when you mount the box back on the feeder, use some rubber washers or bushings and that will help extend the life of the control box, I believe there was a service bulletin on this, ask your dealer. just a suggestion