It is normal for the palm rest panel and bottom panel of the notebook to become warm as the CPU is operating and/or battery charging. This does not indicate a malfunction of the computer. The heat level may varies depending on the peripherals and software you are using and the length of time that the unit is in use.
WARNING: Do not place the notebook computer on your lap for an extended period of time. Extended use of the computer or adapter may cause discomfort. Do not cover the computer or adapter with clothing or blankets when the computer is turned on. Covering these components may result in overheating and damage your unit.