TRANSMISSION IS SLIPPING. TRANSMISSION HESITATES IN LOW GEARS GOING AROUND CORNERS AT LOW SPEEDS. ALSO, TRANSMISSION AT 75MPH CRUISE MOMENTARILY DROPPED OUT OF GEAR, ENGINE RPM WENT UP BY 500 RPM, AND THEN DROPPED BACK INTO GEAR. THESE ARE HAVE AT INFREQUENT AND RANDOM TIMES. HAVE BEEN TOLD BY DEALERS THAT THIS IS DRIVE BY WIRE AND THAT THERE ARE MANY ELECTRONIC SYSTEMS INVOLVED IN CONTROLLING THE TRANSMISSION. HAVE COMPLAINED TO 2 TOYOTA DEALERS. ONE TOLD ME IT WAS A SOFTWARE ISSUE AND THAT TOYOTA WAS WORKING ON A FIX. SECOND DEALER TOLD ME THAT THERE WAS NO TOYOTA SERVICE BULLETINS ON TRANSMISSION PROBLEMS. CONCERN OF TRANSMISSION GOING OUT OF GEAR AND LOSING CONTROL OF VEHICLE. *TR