Help!! Electrical Woes

Hi Everyone,
First my car is a 1997 LeSabre, sometimes when I get in the car, the Dome, Door Locks, Automatic Locks and Key Chime will not work, thne other times they do, car runs good and everything else works, just these items seem to work then not work, so any help to steer me to what to look for would be Greatly appreciated.

Thanks, Jim