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There is a sensor mounted to the bottom of the chill plate called the "evaporator thermistor). This sensor has a wire connection that runs all the way up to the upper front right corner of the icemaker cabinet. Open the door and remove the upper front cover so you can see the 2 wire plugs that go into the upper right hand corner. Unplug the wire connection that goes to the back of the icemaker under the chill plate. This will cause the icemaker to default to a 30 minute cycle. It sounds like this sensor is just failing so you can either leave this sensor unplugged, or you can replace the sensor. The board is designed to default to a 30 minute cycle instead of optimizing the cycle which can lower it to 25 minutes or so if everything is working properly.
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And have you ran it without the sensor attached at all? Because if it's unplugged it should default to a 30 minute cycle. If not then regardless of whether you replace the control board or not, the control board is bad and needs to be replaced again.
Well again, only the control board can short cycle the icemaker if the evaporator sensor is disconnected so my advice would be to replace the control board if it doesn't run a 30 minutes cycle.