FROM TIME TO TIME AS IM DRIVING TO EITHER SPEED UP OR SLOW DOWN, MY CAR HAS NO POWER AND THEN WITHIN 2-3 SECONDS IT HITS HARD BACK INTO GEAR. I RESEARCHED IT ON LINE ABOUT OTHER LEXUS AND IT STATED THAT THE PROBLEM IS IN THE COMPUTER AND IT HAS A GLITCHES IN THE SYSTEM THAT NEEDS TO BE RESET/CLEARED , THERE ARE TIMES WHEN IT HITS SO HARD THAT IT FEELS LIKE YOU HAVE BEEN REAR-ENDED AND HURTS YOUR BACK AND NECK . THIS IS VERY DANGEROUS AND SHOULD BE FIXED BY LEXUS AT LEXUS EXPENSE, THANK YOU