As the voltage can change rapidly in fluctuations, a multimeter is unlikely to follow it. However, you might find a drop in the measured voltage when the load is high, which can be the cause of your problem. To measure voltage fluctuations, you can use a power quality analyzer or energy logger.
If you are using non-dimmable LED lights, they can be causing part of the problem. Non-dimmable LED lights can maintain consistent brightness under a certain amount of voltage variation, but would flicker on and off if the voltage is too unstable.
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