After fishing @ Granby my vex stopped marking my lures and any fish at 70' deep. This never happened before, so I sent the unit in to get checked for any problems. Turns out that it was my transducer that was bad. I got an early model tri-beam and they are replacing it for free! So if you have a tri-beam transducer with the red colored ring on the bottom half of it, they will replace it for free. I guess the plastic on the cover was prone to cracking, I didn't see it at 1st but mine had one small crack on the side.