I read several topics where people complain about auto pause function in walking and hiking. I had the same problem myself with 6x pro, every time I stopped and then restarted walking the watch went into pause and didn't start back.
Thinking it could be due to a too low threshold setting, I tried using "custom" to set a higher threshold.
My surprise was, I cannot set a threshold higher than 36 min/km, which is not a lot, especially when hiking or climbing. Even more surprising, the default setting for walking is 60 min/km but if I try to edit it, still I cannot set it higher than 36, not even back to 60.
Is this a bug? Is there a way to do that?