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Probably still wet on internal electronics.
I would disconnect it's power input. Open it up & check for moisture. Blow out with gentle dry air or If still damp, place a small cotton bag full of rice inside and let that suck all the moisture out for a few hours.
The transducer MUST be in contact with the water for it to operate properly. Check and make sure (if it is a thru-hull) that the ducer isn't in the air when you're planing. I've read that wiping the transducer with Dawn dish detergent speeds up the "wetting" of the transducer and makes for a better contact with the water.