TV and radio commercials were louder than the shows and congress passed a law to change it!
No, it isn't just you. Ads are notorious for being much louder than the actual shows on TV. In 2010 congress passed a law regulating the Federal Communication Commission and volume control. The CALM Act, or the Commercial Advertisement Loudness Mitigation Act, says that the FCC will have to make stations obey certain international volume standards. Our tax dollars at work, folks, sometimes.