The wiper arm could have worked up off the stem? mabey their is a set screw that worked loose that would keep it tight on the stem?
my 2000 tahoe did the same thing, found it to be a bad ground due to the main electrical connector on the rear hatch to the truck had two wires burned that power the rear defrost, the wiper shares the ground with the defrost, if your defroster quit working also thats more than likely your problem also.
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