WHILE DRIVING DOWN ROTE 17M IN MONROE NY TWO OF THE PASSENGERS COMPLAINED THAT THEIR SEAT BELTS LOCKED UP ON THE AGAIN. THESE THE 2 FEMALES NOW IN THE 2ND ROW SEATS WHO WERE INJURED BY THE SEAT BELT FAILURE IN THE 3RD ROW SEATS JUST ONE WEEK PRIOR. BOTH GIRLS HAD THE FACTORY ADJUST ON SO THE SEAT BELT SAT PROPERLY ON THEIR SHOULDERS. THE SEAT BELT ONLY LOOSENED UP AFTER BEING RELEASED FROM THE BUCKLE. CHEVY REFUSES TO REPAIR/REPLACE THE SEAT BELTS/TAHOE. AT THIS POINT THIS HAVE MADE FAILURES OF ALL 6 SEAT BELTS WITH SHOULDER STRAPS. THIS TIME THE GIRLS WERE SITTING ON OPPOSITE SIDES OF THE TAHOE AS COMPARED TO THE 6/12/2005 INCIDENT AND WERE LUCKY NOT TO HAVE RECEIVED BRUISING ON THE OPPOSITE SHOULDERS AS LAST TIME