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That sort of error is owing to a problem with connections or connectors, or even cabling.
If the cabling is unrelable or old, replace it. In fact, whatever cabling is on the boat that was *not* in the shop setup that worked perfectly and reliably, is unreliable cabling.
Connectors can get dirty, or get corroded too. How long was the setup installed on the boat, before the 'radar connection lost' error began ?