My 6YC Yamaha Gauge Malfunction without any explanation from the dealer

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This is the first year of owning my R25 Bennington with a 250HP Yamaha Outboard and the 6YC Yamaha digital gauges. 6 times throughout the summer, the digital gauges would start flashing from daylight to nightlight readout and the speedometer would flash from current speed to 99mph. I had to turn off the engine and restart to get the gauges to stop flashing. I had the dealer come out and he found nothing wrong with the wiring and no fault readings. The dealer has no fix for the problem. Has anyone else experience this same issue with the Yamaha 6YC digital gauge?