I don't really get out much and this weekend used my unit for first time this season. Anyway, when I was watching my unit I noticed it appears almost as if it was restarting the scan about every 2 inches on my 5 inch screen. (See the photo below.) You'll note that just to the right of the depth readout there is a distortion at the surface and at the bottom and solid line (very thin) from top to bottom. Again to the right of that (about 2" on the screen) it happens again. This happens all the time when in operation. Any thoughts about what this is? Thanks!