I swapped out the battery on my wife's Puck Pro but when the new battery goes in, after it does the count down it just starts continually beeping and displaying depth of 576 and av depth of 56.5 on the top row. I thought I might be doing something wrong in screwing the back on, but it does it whether the back is on or not. Can anyone tell me what I'm doing wrong or why it would do that?