I just purchased the Helix 7 si unit first I think I have the transducer to low under hull because I'm getting a rooster tail running the lake so I'm gonna move it up a little more. Even though I went on measurement from instructions, but my problem is when running the lake the unit keeps losing power connection for some reason only when running the out board I trolled for several hours an had no problem besides figuring out how to operate it any help on where to start of what the problem maybe will help thanks in advance