Near Intersection of I-35 & I-90 Southern Mn. | My first thought would be the flow meter itself.
Some debris may have entered the flow meter and has caused the turbine to be lodged. The Raven flow meters are easily disassembled. I don't know which model you have but there is usually a way to disassemble them either with a series of screws or more commonly with an internal snap ring.
Another possibility is excessive wear on the turbine shaft or bushings causing the turbine to drag against its housing. If you see no obvious wiring or setup changes, I'd look into the flow meter.
We have two on our planter. One is for spray and works with spray control as far as rate. The other works with the starter fertilizer and just monitors the rate since the starter is delivered and controlled by a ground driven pump.
Wednesday my great Nephew informed me that the starter system was reporting no flow reading. Since the starter goes through Wilger flow monitors, he could see expected flow to each row via the Wilgers so he was confident that starter was still be being delivered to each row.
Since we wanted to continue planting he disregarded the zero reading. Later he said that things returned to normal so I'm guessing the flow meter stuck or something of that nature.
Had this happened with the spray portion of our planter we would have had to stop and investigate since the loss of the flow meter there would cause problems with the applied rate.
I'd start with the flow meter.
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Trimble Field IQ with Raven flow meter not communicating
