You don't happen to have aluminum wire? I doubt that they would an
electrician would ever have back stabbed aluminum wire. It loosens up
bad enough using the screws on AL/CU approved outlets. They don't
even have the back stab holes.
The wire to the outlet is loose, probably because the wires are "back
stabbed" into the outlet. Remove the back stabbed wire(s) and wrap them
around the side screws and tighten. Turn off the breaker to that outlet
before moving wires.
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