I hear a narrator.
Video description is available for many programs on the secondary audio program, or SAP. If you are hearing a narrator describing what is on screen, you are hearing video description, and that means your television or TV receiver settings have been changed from the primary audio stream to the secondary audio stream. Perhaps there was a software update that changed your settings.
To turn this off, try your Menu, Setup, Options, or Settings buttons on both your TV and your cable box to bring up an on-screen menu of Audio settings. To turn off description, change the audio channel to English, Audio 1, Audio A, or something along those lines.
Some remotes have a dedicated button for changing the audio channel, which makes it easy to turn on and off (though it also makes it easier to change it accidentally). Look for a button called SAP, MTS (which stands for Multichannel Television Sound), LANG, or AUDIO.
If your TV signal is routed through a VCR, it's possible that it's the VCR that has SAP functionality turned on. Usually, it's your cable box.
If you're still having trouble, check the manual for your television or cable box.