Strange, I use a Trek incite I8, wireless and have never had a problem after 1 year. I did have to replace the battery in the sensor after about 9 months but that was $2.50 and if you use the roll out method it is dead accurate. I also have a Garmin 305 Fourunner I ride with just to give me the route from maps when I am done. Both are dead accurate I have done 100 mile ride and one shows 100.11 and the Garmin 100.2. that was the century from a week ago. The Garmin in my estimation is less accurate since I can get confused, or not respond as quick. The Trek responds right away and I have never had a bit of problem. I might add I don't have a Trek bike and I don' t think they Trek is Bike God's in what bike they make.