I came to the conclusion it was the dust.  When the wind is behind me it seems to be worse, and also  in the mornings and evenings when there is little or no wind.

With only 3 wires controlling everything it seems I get ghost readings.  When the seed command starts shutting off 3 rows at a time it will mess up all of them.  I lowered the sound of the alarm all the way down and won't get off and check a row unless it shows no planting after I have turned on the end and restarted.