CP370/B164 issue

Last year installed 2 C127 units, autopilot, radar, CP370 and a B164 transducer. The bottom machine constantly looses bottom around 400 feet and this weekend it would show bottom but not depth and then show static and then clear up with out changing any settings. I have reset the transducer and CP370 several times while underway to try and correct. Is 400 feet the standard depth to loose bottom with these units. After researching and purchasing the units I thought I should be able to get at least 1000 feet?

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