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Do you mean rotate them? Spinning them up would make it worse.
No cold flow would move mass to the lower side when being held vertically causing an imbalance. If you spin up a balanced disk it comes to rest at a random angular position or motor pole.
Randomizing the side of the disk that is down regularly and with relatively short intervals keeps the average displacement of mass due to cold flow near zero.
Of course rotating would also work but that would require a motor with fine positional control when reliable systems thrive on simplicity.