lines on sonar

[leadcore troller]

Running a Lowrance Hook7, on the sonar display i get fine diagonal lines across the screen, is this from running the transducer cable along side all the power cables. Also i loose bottom and display while moving at 15 mph is this normal.

[guffins fisherman]

A pic would tell 1000 words. Losing bottom at higher speeds is not uncommon, especially if your transducer is on the transom.  Sometimes an easy fix, sometimes not.