Keep it simple if all four lights are wired off one switch start there. Lights will be wired as a parallel circuit not in series. Power control starts at switch. IF switch is a dimmer it may be heating up and starting to fail. When dimmer is activated a resistance is applied to circuit “ Turning the switch gives a greater resistance, and hence a lower current through the bulb. However, the power that doesn't come out of the bulb is disappated across this resistor (it will get hot) most flickering is caused by an old, faulty or incompatible wall switch or bulbs that are loose or of poor quality.“.
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