Yes, I've had this problem a number of times and best solutions are obviously to make sure you empty the hopper each day. The fines from your fert mixes will tend to cluster in those gaps between the plate and hopper gate causing it to restrict its shutoff. When its cleaned out I usually every other day or so hit the opening and the slide plate underneath with WD40 or some spray lube ans work it back and forth to keep it working well. If you have to much debri built up in between then it might be best to loosen the 3 bolts to the plate area and hit with a power washer to clear out any build up, then tighten the bolts back up. Hope this helps!