Just did a short mtb ride to test this. This was recorded with my edge 1000 and is dead accurate https://connect.garmin.com/modern/activity/2875445101 and with the 5plus https://connect.garmin.com/modern/activity/2875449702
renton82 How fast is "fast?" A recent trail run with 5x seemed to do fine. I'll see what the 5x+ does this week as I'll be descending pretty quickly from 14,000 feet
Right now, the 5X Plus is totally useless for any jumping related activitiy.
I just got off the phone with Garmin and they have had many many reports of this being an issue. I urge you to call Garmin and send them your data as I was told this will help them with the issue. As for a timeline, no such luck. Until then, our watches aren't overly useful.
I own a Fenix5. I try to downgrade to 6.0 later today.