My electric Dryer keeps blowing high limit fuse and I have a repair contract, they have come several time they changed the heating element, they changed the thermal cutoff , they changed the high limit thermostat, they dryer cycling thermostat and the the thermal cut off. They also changed the timer.Each time they came they stated that the high limit thermostat was blown after the first few times it would work for 1 load then just blow cold air. Yet again this last time they came they changed all the parts again mentioned above except the timer and the dryer did 5 loads on different days without a problem then on the 6th load it's blowing cold again. Anyone have any thoughts on what else they check to fix this problem, it seems that the high limit thermostat has blown every time they come to repair?

Model #LER4434AW0