Symptom: Speed and cadence value can sometimes go to zero when the bicycle is moving, resulting in incorrect average speed and cadence values. Sometimes it can be due to misaligned magnets or incorrect wheel sizes in Karoo's Settings.
Affects Versions: All versions
1. Check the magnets and batteries for all sensors.
2. Set the wheel size in Karoo's setting that is appropriate for the wheel, the default wheel circumference in Karoo is for a 700c rim (15-17mm internal width) mounted with 25c tire inflated to 80 psi (~ 5.5 Bar). See Wheel Circumference Chart http://www.bikecalc.com/wheel_size_math for details
3. If all else fails, replace the speed sensor with an accelerometer-based sensor like this: https://buy.garmin.com/en-US/US/p/146897 or https://www.wahoofitness.com/devices/bike-sensors/bluetooth-speed-sensor