I had a new Toto Drake installed less than a month ago by a licensed plumber and today I noticed that the tank has cracked around the handle and the crack is moving down the tank. I know the cracks were not there immediately after install. I am wondering if this was caused by the handle being installed incorrectly or if it is a defect in the toilet tank. Has anyone had this problem? I am just wondering if I should be calling the plumber or Toto tomorrow.