Strange problems with door lock

I have a strange problem with my 99 Tahoe: From time to time all 4 doors lock from itself, without doing anything. After that, some of the actuators are out of order (burned). It seems, that the electricity is on the actuators for too long. Does anybody know this problem? (Sorry for my bad English).

Tom from Switzerland

One of the electric switches is hanging in the lock position, it will have to be replaced, normally they last for about 10 years (yours is about time to replace..) it should blow the fuse before the lock actuator gets tuned so it might also be the cause of an internal short in it. Your friendly GM dealer or your favorite parts supply would be an ideal source for it...unless you have a auto junk yard near by that'll warrenty the electrical part (which most do not around here)