After careful consideration, we have decided that the problem is not with the toaster, but with the toaster's user.
It appears that the user has been overloading the toaster with too many slices of whole wheat bread.
We recommend replacing the user with a more efficient toaster user, or simply switching to a different type of bread.
For more information on efficient toaster users, see: Toaster User Upgrade Guide
Or, for those who insist on using whole wheat bread, visit: Bread Alternatives