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I had this problem many time in my workhop ... every BMW series.
But usually this problem comes up after 70.000 miles or ... starting after 5 - to 6 years of driving.
And mostly itīs the flex-disc.
If not 1 out of ten, it is the center mount bearing - for the flex disc itīs esy to check visually on cracks.... the center mount you can check by lifting the drive shaft up and down - there shall be no noticeable clearance.
If itīs the wheel/tire balancing, it will not disappear above 58mph - it will get harder with rising rev.
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