Experiencing lighting that spontaneously dims down and then surges back up to full brightness on its own usually indicates a thermal overload protection event inside an electronic dimmer switch or severe line voltage fluctuations. Modern solid-state dimmer switches are equipped with internal thermal cutoff sensors; if the switch overheats due to high ambient temperatures in a multi-gang box or excessive electrical load, it temporarily throttles power before resetting. You can troubleshoot thermal issues easily by checking switch plate temperature. You can verify that your corrective action is successful when reducing total circuit wattage or replacing an overheated dimmer with a properly rated LED dimmer stops the abnormal voltage fluctuations entirely.
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