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Here's another possibility: has the transducer pivoted on the mount such that it is no longer in a "horizontal" position? My Garmin transducer has a toothed ring which the transducer loosely locks into and some times if you take a wave hard the transducer will move a tooth or 2 in the mount so that it no longer points down. You do not want to over tighten as this is a way to prevent breaking the mount on hard hits.
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