Hopefully you are using the ice transducer, and as mentioned, it's positioned properly at, or just below the bottom of the ice.
I would also try to reduce sensitivity and try a few Hz ranges to see where the return paints the best picture.
Like I said, on a high end unit, it's not plug and play. The ability to make adjustments, and give you the best results in a wide range of conditions is the trade off against having to know how to set up and use the unit.
Also, like Huntfurfish suggests, if that isn't working a reset might be in order.
I'd also check the inputs on where the transducer plugs into the unit - maybe something is wonky there.
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