Garmin Vivoactive question

I've been wearing this watch everyday for almost 2 years and I have never seen this display. I walk dog so I am constantly turning my watch on and off to measure the distance... I don't know if I hit a setting to change something but it feels like every 2 or 3 minutes it is vibrating and this equal sign shows up almost like it's a pause but it seems to still be counting time and distance while it's on and then it will just go off again. I turned my watch completely off and back on and it doesn't seem to have made a difference does anyone know what it is and how I can get it to stop doing it