Hi, does anyone know why my Fenix 3 HR might suddenly be recording a significant drop or change in resting calories. For months my resting calories have been 1,963 or thereabouts yet from May 5 they have dropped to 1,636. I could understand if it was up or down by a few when I update changes in my weight but a drop of over 300 doesn't seem right to me. Has anyone else experienced a sudden change?