Unit flashes depth reading (I swear it is deeper than 2.2 feet!! it was more like 900) while drifting and while running at different speeds, does not always do it but when it does start it seems like it can take up to 10 minutes to clear and start reading correctly again.
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I assume that when it resets to 2.2 feet that the readout is flashing. If so the it sounds like you have a bad transducer as the problem has been getting progressively worse.
The transducer needs to be replaced. Sounds like the sending crystal is fractured.
Sounds like the transducer is installed at the wrong angle or in such a way that it is getting a lot of air from something on the hull. If it is a transom mount, check that it is angled correctly and not too close to the motor or aft of some kind of thru-hull fitting that will cause turbulence.
If the transducer is mounted off of level, an error is introduced due to angle. It is a fixed percent offset, say 10%. so 10 feet reads 11 and 100 reads 110. There is an offset function to read depth below ducer, depth below keel, and depth below waterline, but these are fixed amounts in feet, not a percentage. Look at the transducer when it is operating, boat angle considered.