Guys at Sport & Fitness has begun an investigation into this feature. I have found several instances present here as well. I was asked to create a separate topic here (as I own an Epix) to bring attention of our dear Admins as well.
I am describing my personal problem here. Performing a Guided Test to Determine Your Lactate Threshold - epix 2 - Wearables - Garmin Forums
Happy to share any additional info if required.
Garmin-Jimmy Garmin_ODQA Mel_ODQA Kelly_ODQA Jeff_ODQA Garmin - Chris