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The large burner pulls more power than the rest so it will make a louder sort of high pitched humming/ringing sound when it's used and that is 100% normal. If you hear any zapping or sparking then that is not normal and you'll want to call your extended warranty company to look at the unit.
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It's not constant because the unit heats up ON and OFF, there is no inbetween. To regulate the temperatures it will turn on for a few seconds and off for a few seconds depending on what temperature you have it set. If you set it to the highest setting then it's just ON and doesn't turn off so if it's surging on the highest setting then it shouldn't be doing that.
I'm not sure what you mean by "nope".