I have owned my Edge Explorer for nearly three years. I have a number of courses on it. Suddenly, this year, when I start riding a course, the instructions--turn right in 50 meters, etc.--do not appear. In two recent rides, they appeared once each, then stopped. I can navigate by opening up the map within the course menu--it shows the course, where I am, and what direction I am pointing in. It is not so good when there is s tricky turn to make, however. I have spoken to two Garmin representatives and they haven't been able to help me. Any ideas? Thanks.