Transmission whining at 4th and 5th gear?

I have a 2012 honda accord 49500 miles. I bought it brand new but when it reached to 49500. The transmision automatic act weird. When i drive on freeway. At 4th and 5 th gear start humming a lot. And i checked transmision fluid when engine off and hot. It is in the middle between cold and hot. Is it normal the tranny whine at 4th and 5th gear. It whinning around 55-60 mph after that the noise go away

Hi so has it been serviced and maintained by a Honda dealer as it needed to be. The warranty would still be valid so they would have changed the gearbox or at least cured the issue.

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