Can anyone help with my intensity minutes. I complete 60 minute bootcamp, I have completed 3 this week and 2 = 82 minutes and 1=0. Usually they would account for much more

Check the pulse data. Intensity minutes are calculated from the heart rate. If you are using wrist optical heart rate it doesn't always works good. Always better to use a chest strap. 

Hi, I understand that chest straps are more accurate, but I have been using the watch for over 12 months and this has only been happening in the last week. 

Might be some temporary issue. A restart is good to do from time to time. That can solve many strange issues.

It could also be that the watch isn't in the correct place or isn't tight enough around your wrist or too tight.

Check your HR zone data for the workouts, intensity minutes only get saved at zone 3 or higher. 

May also need to clean the sensors on the back of the watch.  Sunscreen, sweat, lotions, dirt, etc can interfere with picking up heart rate.