You just built a breadboard of your expert design. You did all the simulations needed before going to layout, and reviewed the manufacturer's suggested techniques for a good thermal design for the particular package chosen. You even did your due diligence in going through the initial thermal analysis equations on paper to be sure not to exceed IC junction temperatures with a comfortable margin. But wait, you turn on the power and the IC is pretty hot to the touch. You are uncomfortable with this (not to mention the concern of your thermal experts and reliability people). Now what do you do?