2009 Ford F-150 Power Train

MY 2009 FORD F-150 HAS THE REVERSE SENSING SYSTEM AND CAMERA AS WELL AS THE SYNC PACKAGE, SO WHEN IN REVERSE THE SCREEN SHOWS THE OBJECTS BEHIND AND HAS PARALLEL LINES "TRUCK WIDTH" & A CENTER BLACK LINE TO JUDGE WHERE THE TRUCK IS "AIMED" IN REVERSE. ON THE ABOVE DATE, ALL THE LINES DISAPPEARED FROM THE SCREEN. THE NEXT DAY THE TWO LINES (1/3 GREEN,1/3 ORANGE, 1/3 RED WERE BACK ON THE SCREEN AS WAS THE BLACK CENTER LINE. THAT EVENING AS I LEFT WORK I CHECKED, NO LINES AGAIN. SAME THING THE NEXT DAY, THEY ARE THERE ONCE OR TWICE IN AM, THEN DISAPPEAR. NOT A SHOW STOPPER PROBLEM, BUT MAKES BACKING UP WITH THE CAMERA A LOT MORE DIFFICULT. PLAN TO APPROACH DEALER ON THIS, BUT HOW DO I SHOW THEM THE PROBLEM IF I CAN'T "MAKE IT HAPPEN", HOPEFULLY I'LL GET LUCKY!!! IF SOMEONE HAS HAD SIMILAR EXPERIENCE WITH THIS SYNC COMPUTER SYSTEM, MAYBE THERE IS A SOLUTION EXISTENT ???? *TR