Hello, I am a ceramics instructor and I have been making ceramics for over 30 years. I use Laguna clay. Recently I have a new issue with their bmix. I am having over 1/2 of my handles on my mugs crack at the join. This has never happened before. I dry extremely slowly. In magic boxes for over a week then in plastic wrap for over a week. I never used slip with vinegar before but tried it when this started happening and it still cracks. I also never waxed my handles but tried that as well. Is anyone else having issues? Or does anyone have any suggestions? Did they change their recipe?