Happened to me too at very early 40 and not only to me. There is other threads complaining that DD's have "psychic powers". Some messages claimed that this is known glitch that when sub presents excellent sonar target cause angle and DD is near by it does start to ping.
So, maybe they really have "psychic" powers.
Some peoples told that DD's that were mess with before stays alerted state and may ping randomly.
Who knows?
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