Yes this does indeed happen some times the sonar man goes deaf. If you make a sweep yourself you will hear the contact. Usually this problem goes away after a few minutes. If not then replace your sonar man for a while and try again.
Also depending on you type of hydrophone they do have "blind spots" where they do not hear a contact very well specially at high speeds. So make sure the contact you are tracking is not in your baffles and try to keep your speed 2-3 kts or stop altogether.
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