Riding along and motor cut out while in cadence Pedel Assist mode. Throttle would work though. Later neither PA or throttle would work. It lasts just for a short time but has been doing it several times now. A yellow triangle error symbol showed in the display with a message but it goes away before I am able to read it. Sam at e bike center in Fullerton called Chris Head and seems it could be an issue with the allignment of the sensors in the cranks or a controller. They are having trouble getting replacement parts from China. No fix so far...will continue to monitor.