Official comment
During playback, it may get hot if your graphics card is trying hard to keep up with the visuals. Try going into Preferences > View and change the Waveform Drawing Rate to the lowest setting.
When you are analysing tracks, this is normal, especially in performance mode where the software will use all available CPU cores. If you want to cool it down, go into Preferences > Analysis and at the bottom, change the Analysis Process mode from Performance to Normal.