Honda accord 2012 steering vibration?

I have a honda accord 2012 LX has 28344 miles. I went to honda dealer and they did alignment, tire balanced, they also changed the tire. But the steering is still virabte at 65mph on highway. I went to the honda dealer 4 times. Abd they could'nt fix it. When i bought this car brand new, i never had that kind of the problem. I' m getting mad now.

Have you checked the steering rack shaft "knuckle joint via pinion shaft.Honda accord 2012 steering vibration - 1

If the car is having vibration problem at 65 Mph; the wheel rims or the tires have defect and need to be check out or the wheel balancing was not done correctly. It could be the tires has some kind of liquid in it like "Flat repair" or similar products in it that prevent the tire balancing done correctly.

The only way is to separate the tires from the wheel rims and clean out foreign materials (Flat repair) or recalibrate the wheel balancing machine and balancing the wheel assemblies again.