quite often when I'm running my watch vibrates and beeps at me, I look down and the watch face has temporarily changed to some kind of warning. I think it says 1.0 or maybe just 1 and I think there's a red triangle in there. It happens quickly and I can't quite catch what specifically is on there. This is not a warning that I've exceeded a target and it seems totally random, it's not a 1.0 mile or lap alert as it happens between miles and not always in the beginning.
