Air Pressure
Another possibility...If you drive the car very infrequently, tires can get a "flat spot" from sitting on the same area all of the time. Then when you first drive it, it is bumpy for a while until the tires adjust.
I was advised to keep 50 pounds of air in the tires while my "summer" car is in storage and then adjust the pressure when I intend to use it regularly. It does not harm the tires and eliminates the "flat spotting" that can occur.
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