Yup, must be your towed array dragging over the bottom, especially if you are close to the bottom. Solution is to speed up a bit (above 6 or so it won't happen, I think), rise, or even better is to reel it in as neccessary. It doesn't need to be extended all the way anyway. A 3rd of the length is usually enough for good sensitivity. But that depends on your environment/tactical situation (and it also makes straightening after a turn go quicker)
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