Apple Watch Cracking

Has anyone else had an issue with the screen of their Apple Watch cracking due to the heat? I was running a few days ago and I heard the sound of glass cracking almost the same as when a rock hits your windshield. Well, a few minutes after that I looked down to see what time it was and noticed my screen cracked. I finished my run and looked at my watch again and it had broken even more. Please tell me I am not the only one this has happened to.