I have worked in the electrical business for many years. In todays construction industry you have people wiring houses who work under a licensed electrician. They are not necessarily electricians by training. To save time a lot of contractors use the push-in type connection for outlets and switches instead of using the screw and wire connection, because it is faster. The push-in connection seems to fail more often. Hire someone who knows what they are doing. I am sure there is someone who can help you who may be a retired electrician or a savy home handyman.
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