My vivoactive 4s freezes twice during my trip to Vail, CO early this week. The first time was on Monday while I was hiking the Shrine Ridge Pass (elevation 11,102 ft at the trailhead with an elevation gain of 1,030 ft); the second time was Wednesday at the Booth Lake Trail (elevation 9187ft at the trailhead and elevation gain 3,051ft). For both hikes, it freezes at the same time 0:26 (see pic). By the time I finished the hikes, the battery was gone. After I recharge the battery, the watch runs okay. My watch had been reliable until these hikes. I wonder if the freeze has something to do with the altitude.
Thanks.
Pui