This could be coming from either a problem in the alternator, or the light switch, or the battery ground cables, or the wiring for the lights. If your new vehicle warranty is still in force; the dealership should fix it for free.
If the vehicle is no longer under warranty; then I would recommend having the alternator checked for bad diodes and proper voltage regulation. It would be preferable to use an oscilloscope to display the alternator output waveform; in order to evaluate its operating performance. This is a test that can be done by an auto electrical specialist who has a diagnostic oscilloscope; and who is familiar with the use of this instrument in alternator diagnosis. At the time of the test; it is also recommended that the ground cables be examined, to confirm that all the original ground cables are in place, and are in good working order. I have seen new vehicles which were missing cables when they were shipped from the factory.
If the alternator and grounds are all operating properly; then the entire lighting circuit should be tested and examined.
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