Up until yesterday, I was able to shed for hours on end with a relaxed embouchure and focused air stream. Starting yesterday, I can't play for more than a few minutes before my chops are tightening up. I haven't changed mouthpieces, reed strength, etc. I shed (long) overtones religiously (Allard exercises). This feels like what week 1 felt like, can't play **** for more than a few minutes. Have any of you multi-year players run into this?