Thanks for all of the responses. I wasn't trying to turn this into a Humminbird vs. Lowrance, vs........etc. I was simply trying to see if anyone experienced the same or similar issue to mine and what they did to resolve it. I'm actually very happy the unit, or at least I was right up until I had this issue. I did contact Humminbird CS and they were very nice over the phone and seemed genuinely interested in helping. They recommended some of the same things mentioned in the posts here, ie; check the positioning of the transducer, check for any damage to the transducer and cable. They recommended that I reset the unit to the factory default and try it again, which I will do this weekend. Hopefully it will resolve and I can get the unit functioning as well as I know it's capable of.