I would say if you are loosing bottom only in shallow bays, especially in the summer, your sensitivity may be picking up a thermocline that is close to your bottom and the sounder (all sounders) will loose bottom.
You might have to play with gain and filters, usually the instruction manual discusses this. If not, try the Airmar website, I believe it did at one time.
Make sure you are on 200hz only and not dual.
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