The freezer trick can affect all sorts of things. I've encountered IC's and transistors that became temperature sensitive and could be coaxed to behave sometimes by heating or cooling them.

I suspect the rubber bumper is the cause of the Quantum drives sticking. I worked on two Minolta color laser printers that had all sorts of jamming issues. The cause turned out to be sticky rubber bumpers on a number of solenoids buried throughout the printer, it was a nightmare to get to them.