the only real fix is to remove the head assembly without damaging it, and re-lubricating the actuator shaft bering. Other quantum models is the park release lever. all depends on which model. If you take a quantum dead HDD that you dont give 2 shits about, you can feel the "grunt" or stiffness at the park position of the head. This is the issue.

Also the magnets loosing thier permeability over the years isnt helping. The servos are pretty lenient and will do anything to keep lock over adverse conditions, but if the magnets arnt strong enough it wont overcome the friction required to release from park. So the other option is to lubricate the shaft.