This problem is minimized when the various feed ingredients have a similar particle size. Additionally, self feeders need to be examined more than once a day during wet weather to clean out spoiled feed. Feed intake is related to water intake. A slow water fountain during hot weather will reduce intake. Frozen water fountains shut off intake.
Clean water fountains on a regular basis.
If irregular intake continues to be a problem, check the water quality and perhaps the fountain for stray voltage.