I Have Been Going To Bikram Yoga Classes For Over

I have been going to Bikram yoga classes for over 6 months now 2-4 times per week. I recently started feeling a rubber band snapping sensation in my left knee region. Meaning not really in the knee but around the sides and behind. The snapping feels superficial as if it was fascia tearing. And there is a snapping sound associated with it. Should I be concerned? It's a little startling when it happens. Kind of a tiny shock feeling. Anyone know what this could be? Thanks!