Amana Dryer No Heat

It is an electric model. The thermal fuse went out so I replaced that, then after a few loads the 12ga wire supplying power to the heating element burnt thru, so I cut the end off put on a new female spade connector and plugged it back into the heating element assembly. Worked great for a few loads and now the wire has burnt through again at the end where it plugs into the heating element.
Any ideas whats going on ? The dryer is maybe 6 0r 7 years old used once or twice a week.