Went out Sunday it was working fine found the spot we were to fish anchored up. Started fishing about 45 min. later i looked down at the depth finder & it read 475 feet but we were only in 22 feet of water. I just shut it off for the rest of the day. Went out today and it would not read depth at all just temp. I disconnected the power wire & plugged it back in & same thing no depth. Any ideas. I have a new transom mount transducer that i may try to mount it to the trolling motor to see if it is problem. Thanks Jim C.