2001 Ford Escape 6cyl electrical problem?

I was barely moving in stop/go traffic for over 1/2 hour due to unexpected snow storm, while in 4×4, with lights, and radio on, my radio shut off and then I noticed my windshield wipers were very slow.  I shut off all lights, and wipers and after a few seconds my radio came back on.  I drove the rest of the way home with all unnecessary electrical off.  The battery is only about 1.5 years old.  Thanks for your help.  I’m a single mom with no mechanical skills but willing to try!