my sinn chrono i dont let it run since i bought it this year, last month i went jogging so i time my run, the chrono second at 59 up and down. i stop the chrono back to zero start again, same thing happen. i on and off the chrono now it ok. i will sent to hourglass
service center next week see what they(technician) say whether on or off the chrono is better i will update.