I had a similar problem. Does the sound seem to cycle?
I find that time compression in the radio room was making certain sounds get 'stuck'. I find myself wondering if the problem doesn't explain the weird sounds people were posting about the other day (I had a repeated banging-scraping that I figured out was part of the hull sounds of being at depth -- stuck, and cycling ever four or five seconds). Unlike most sounds, this will be audible in the sonar station ('h') no matter which way you're looking.
Is this it?
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