There's a good chance you have a flaky connection somewhere. You need to check all the connections in any and all junction boxes, outlet boxes, and light switch boxes that are related to that circuit. Often times there will be a loose screw, the wires may not be twisted together correctly, a loose marret, corrosion, broken wire etc. If you are unlucky you will have a junction point hidden somewhere in a wall or ceiling.
TURN OFF THE POWER BEFORE YOU START TAKING THINGS APART!
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