So I purchased my flx28 about 2 weeks ago and the second time out using it I was in 23ft of water and it would periodically say I was it 10ft of water and it would jump around for like a minute then it would go back to normal. A friend told me that the flx28 is very sensitive and when a big school of fish would come through it would jump around like that but I think my transducer is acting up. Any suggestions? please and thank you