NHTSA Complaint #11181267 — 2018 TOYOTA HIGHLANDER

AFTER CAR HAS BEEN DRIVEN, IS OFF AND SITTING IN LOCKED GARAGE AFTER ABOUT 2 HOURS A LOUD BUZZING SOUND CAN BE HEARD WHICH EVENTUALLY CHANGES TO A LOW SEMI BUZZING (ALMOST LIKE A COMPUTER DOWNLOADING AND A FAN TO COOL IT DOWN). I'VE CONTACTED THE SERVICE DEPARTMENT AND LEFT A DETAILED MESSAGE, BUT NO RESPONSE. I'M AWARE OF CYBER SECURITY, AND SINCE MY HUSBAND WORKS FOR DOE (WAPA), IT WORRIES ME. MY HUSBAND ALTERNATES WEEKLY ON DRIVING THE HIGHLANDER OR THE 2000 TACOMA. WHEN HE DOESN'T DRIVE THE HIGHLANDER THERE IS NO NOISE, WHEN HE DOES THE BUZZING SOUND HAPPENS. THIS IS TOO COINCIDENTAL. IS THIS NORMAL? THE SOUND APPEARS LOUDEST BY THE RIGHT REAR WHEEL WELL. IT NORMALLY HAPPENS AFTER 11:00 P.M. AND COMPLETES BEFORE 11:30 P.M., HOWEVER, OVER THE PAST 4 DAYS THE SCHEDULE HAS CHANGED. TONIGHT IT RAN FROM 8:00 P.M. TO 8:35 P.M. WHAT IS GOING ON WITH OUR NEW VEHICLE? IS IT SAFE FOR MY HUSBAND TO DRIVE?