Sports Tracker on Apple Watch: app crashes when taking a break while following a route

[Julfox]

Hi.

Coming from a Suunto watch. I have been using an Apple Watch for several weeks now with the Sports Tracker application.
I suffered three crashes with Sports Tracker on my Apple Watch recording an activity and I noticed it happens when I take a break, or stay on the same spot for some time, when I follow a route I created on the iPhone with the Sports Tracker app and transferred it on the watch.

Examples of crashes:

Activity 1, December the 30th:
A Walk in the mountain in Spain.
Followed a route I had created on my phone.
Application crashed on my watch after 1 h 03 (3, 5 km) of recording when I took a break in a bar to drink a coffee. I don’t think I paused the activity (but I don’t remember to be honest). I stayed there about 30 minutes. When I wanted to continue the route, the app had disappeared from the main screen. I had to start an activity again with the same route. And I was lucky: I could find the previous recorded activity in the History of my watch. It crashed but it was stored.

Activity 2, January the 3rd:
A ride with a mountain bike in France.
Followed a route I had created on my phone.
Application crashed on my watch after 47 minutes (7 km) when I took a break for 5 minutes. I did not pause the activity. But when I wanted to continue the app was already crashed. I could find it in the history. I had to start a new activity.

Activity 3, today January the 10th:
A ride with a mountain bike in France.
Followed a route I had created on my phone.
Application crashed on my watch after 1 h 23 minutes when I took a break to take some pictures (maybe 5-10 minutes) when I wanted to continue the app was already crashed. I could find it in the history. I had to start a new activity.

NOTE: I have also recorded activities that did not crash, not sure but I don’t remember having stopped or taking a break.

My profile:

I have a profile I started in 2009 with 1740 recorded activities/Workouts. I have currently about 30 routes stored. I usually delete the old routes I don’t use anymore.
All softwares are up to date. Sports Tracker v7.4.0, iPhone 16 PM iOS 26.2, Apple Watch Ultra 2 WatchOS 26.2.

Anybody having the same problem?