I use Bluetooth wireless earphones when biking/skiing and when Iturn my head it cuts out.

I use Bluetooth wireless earphones when biking/skiing and when I turn my head it cuts out. The phone is in my chest pocket or on the handlebars. Happens on both Jabra and Outdoor Tech products with my 5s. The control earpiece is on the right and it happens when I turn my head to the right. Could my head be blocking the signal? I'm not that dense!