I WAS DRIVING ON THE FREEWAY WITH THE LANE KEEP ASSIST AND ADAPTIVE CRUISE CONTROL ENGAGED.THE SYSTEM WORKED FINE FOR A WHILE BUT WHEN I TOOK MY EYES OFF THE ROAD FOR A QUICK MINUTE TO GRAB SOMETHING FROM THE BACK SEAT, THE SYSTEM EITHER DISENGAGED WITHOUT A WARANING OR DECIDED TO STEER TO THE LEFT OUTOF THE LANE, BECAUSE IN THAT SHORT TIME, IT MOVED TWO LANES TO THE LEFT AND HIT THE ROAD BARRIER DEPLOYING THE AIRBAGS AND CAUSING INJURIES TO THE PASSENGERS. THE VEHICLE WAS DECLARED A TOTAL LOSS. THERE WERE NO WARNINGSS BEFORE OR DURING THE INCIDENT TO INDICATE ANY KIND OF ISSUE. I BELIEVE THE HDA SOFTWARE ON THE EV6 IS QUITE BUGGY AS A SIMILAR INCIDENT HAPPENED A FEW MONTHS PRIOR WHEN THE CAR RANDOMLY DECIDED TO TAKE AN EVASIVE ACTION TO THE RIGHT WHEN THERE WAS NO ONE ELSE ON THE ROAD. IN THAT INSTANCE I WAS HOLDING THE STEERING WHEEL WITH MY EYES ON THE ROAD SO I WAS ABLE TO APPLY IMMEDIATE CORRECTIVE ACTION TO PREVENT A MISHAP