Charge 3 won’t record exercises automatically

[Scottsel]

Hi 

my charge 3 won’t record walks - it used too, but now it does not. 
mots set to 10 min auto abs I did 2 hours yesterday and one hour abs half today and it’s not picked them up. 
It’s recognised and recorded my steps, tone active and calories but not the exercise. 
Can anyone help please? 

Moderator edit: subject for clarity 

[LiliyaFitbit]

Welcome to the Fitbit Community, @Scottsel.

Thank you for sharing the details of the issue you’re experiencing. I appreciate your efforts to resolve this. SmartTrack recognizes activities based on the continuous movement of your arms. Sometimes, motions such as placing your arms on the bar of a treadmill, or pushing a stroller while you walk, may interrupt SmartTrack. Additionally, stopping in the middle of an exercise may interrupt the activity tracking. I recommend restarting your tracker: How do I restart my Fitbit device?

If the issue persists, try wearing the tracker on a different wrist as, in some cases, changing the wrist that you wear your tracker on can improve activity recognition. Remember that if you change your wrist, you should also change your handedness setting. For more information on how wearing your tracker affects accuracy, please see Does the wrist I wear my device on affect accuracy? 

For more information about SmartTrack, see How do I track my activity with my Fitbit device?

Keep me posted on the outcome.