Had it happen with both a GSC10 and the magnetless accelerometer sensor and my Edge1000. Although it tends to happen less frequently if the accelerometer sensor is on the front wheel hub and not the back. In both devices in all cases, batteries were ruled out. Frame isn't abnormally large, a custom job but still within in the 56cm roadie size class.

Costing for extended periods can trigger it IME. "Extended", meaning more than 10-15 seconds. One of the perks of living on the Great Plains, there ain't much opportunity for coasting.