I have used DS for approx. 2 years and have never had a problem. However, recently I started paying attention to the "distance" record and I see the numbers (feet) displayed are much less than the actual distance traveled. I noticed this problem when I "zeroed" a 1/4 mile run at the start and 11.8 secs (my track time slip) later the DS log indicated I had traveled 532 feet instead of 1320 feet. I was not expecting 100% accuracy, but this error is huge. I have the correct tire diameter and differential ratio listed in preferences. Have other DS users noticed this error????