An outlet that only works when you wiggle the plug is a burnt or loose contact, and it is a fire risk more than an inconvenience. AAA Electric electricians in Carbon Cliff, IL replace worn receptacles and switches, correct reversed polarity and open grounds, and rewire boxes that were backstabbed instead of screwed down.
We use commercial grade devices on the swap, install tamper resistant receptacles where kids live, and put the right dimmer on LED fixtures so the buzzing and flicker stops.