What function do I use to track walking or running indoors (not on treadmills)?

Hello

I just used the F265, before I used the F945 it had the Track function to track activities such as walking, running indoors without using a treadmill.

In the 265 I saw the indoor walking function but when I was walking, still swinging my arms to walk normally, it often paused for about ten seconds and then continued.

I asked Garmin but they asked me to provide a video recording of the activity or to access my account without any further advice. and I also don't like sharing such detailed.

I also set it to stop automatically when I stop, but it still stops automatically even though I am still walking normally? Do you know the reason?

Thanks