Instinct 2 GPS not working through clothing

Hello all, I've recently started encountering an issue with my Instinct 2 where it's not tracking GPS when I'm wearing a coat. I make sure it's obtained GPS before I start the activity, such as a hike or cycle, but when I get to the end of the activity I notice it hasn't tracked my location at all. Whenever the watch goes under my coat sleeve it loses signal. It never used to do this. Anyone else having this issue?