Using my Garmin FR235 for over 2 years now. Recently, I've noticed that my Cadence sometimes shows a zero. I run once or twice a week, for around 4km each session. Any fix for this or is my watch malfunctioning because it doesn't happen every time, rather like once every 4 or 5 run sessions.
Other data like HR, speed, pace... shows up on the watch without issue.