Torn Calf Muscle

I am a martial artist. I was ready to begin a sparring match last year and when I started to “take off” everyone in class heard this loud riippp noise. I instanlty fell to the ground. My calf was torn and I couldnt put any weight on it at all. This year -last week end while training I started to feel a not forming inside my calf. It didn’t hurt so I tried to stretch it out. As I continued training I ripped it again. Same pain same sound-same deal. What is up with this-reoccuring injury. Can you give me any advice? My doctor says little can be done because it is a muscle tear.