I have had this happen a few times. I have added an activity to the list of the watch for snow shoveling. It can be done and has worked. However, I have got it started and several times now it has stopped on its own. I got done and went to to stop tracking and then save the activity but it had already stopped. I don't know what would cause this. It is winter and cold and I have on a coat with a layer under it. But I don't see how a coat or sleeve could press on the start/stop button.
Sometimes I pause a bit as I'm shoveling and am not moving or active for a little while.
It is also kind of hard to get around on the screen and press buttons while also trying to hold the coat sleeve up so you can get at this stuff.
I'm pretty happy with the watch, except this is an a strenuous activity worth tracking and keeping track of separately from just general background activity. Today I only logged 2 minutes of htis activity which took considerably longer than that. i think this was probably when I went to stop it and it was already stopped I wound up starting it again.
I know today I started the tracking while sitting in my car and was preoccupied for a few minutes after I first started it and this time, unlike normally I actually got the GPS signal before I cot started. I have gone for walks and just started before GPS was ready and it apparently worked just fine as there was a report and a map of where I went. Maybe I might have missed a few steps.