2009 NISSAN SENTRA Power Train Problems

I HAVE BEEN GETTING GRINDING NOISES FROM MY TRANSMISSION SINCE THE FALL OF 2016. TOOK THE CAR INTO THE GEORGESVILLE NISSAN SHOP IN COLUMBUS, OH WHERE THEY STATED THEY CAN'T RECREATE THE NOISE OR HEAR IT EVEN THOUGH THE NOISE IS NOTICEABLE WHEN THE CAR STARTS TO MOVE AFTER SITTING STILL FOR AT LEAST HALF AN HOUR. IT SOUNDS AS IF SOMEONE ISN'T PUSHING ON THE CLUTCH BEFORE CHANGING GEARS, THE PROBLEM IS THOUGH THIS IS AN AUTOMATIC TRANSMISSION. I HAVE GONE TO THE SHOP A FEW TIMES WHERE I'VE BEEN GIVEN THE SAME THING, THEY CAN'T RECREATE IT. MY CAR WAS UNDER WARRANTY AT THE TIME AND NOW IT'S NOT. I FEEL AS THOUGH THIS WAS THEM TRYING TO NOT REPLACE MY TRANSMISSION UNDER WARRANTY. THE CAR WAS AROUND 90K MILES WHEN THE PROBLEM STARTED AND I'VE BEEN THERE TWO OR THREE TIMES. NOW MY CAR IS AT 123K...

MY VEHICLES TRANSMISSION WARRANTY ENDED AT 120,000 MILES. MY VEHICLE HAS ABOUT 145,500 MILES. I'VE READ ONLINE THESE VEHICLES WITH CVT TRANSMISSION HAVE ISSUES WITH REPAIR CODE P0744. THEY HAVE A SERVICE BULLETIN FOR OLDER VEHICLES EXCEPT MINE TO REPLACE TRANSMISSION VALVE BODY ASSEMBLY. I CALLED NISSAN CONSUMER AFFAIRS AND WAS TOLD THEY CANNOT HELP BECAUSE WARRANTY EXPIRED AND VEHICLE IS OLD. ALL I'M ASKING FOR THEM TO COVER MOST OF THE REPAIRS OR ALL OF IT. IN THIS CASE VEHICLE CAR WAS BEING DRIVEN. VEHICLES RPM FLUCTUATED? JERKED AND LOST SPEED, THEN SPEED WOULD INCREASE. REPAIRS IS GOING TO COST ME OVER $1200.00.

DURING NORMAL DRIVING, REACH THE TRAFFIC LIGHTS, ENGINE STALL WHEN THE BRAKE IS APPLIED AT THE STOP LIGHT. AFTERWARDS, I CAN RESTART THE CAR NORMALLY. THIS HAS HAPPENED A COUPLE OF TIMES, ABOUT ONE MONTH APART.