I think anything with a HDD will have this problem. My thoughts are to keep the deck in a suspension bag & away from stage monitors.
Sure there's a liability for HD being susceptible at least while writing, but seems the MR-1000 is showing to be way too susceptible.
I'd guess either there is a hard drive being used inside that is not the best for this application, and/or the drive is mounted in the center of a flexible board with too little support (the trampoline effect) that amplifies vibrations of all kinds.
If the board IS found to be not suspended, suspect there's a support connection to the outer case cover, and it's this cover not having stiffeners molded in that's way too flexible acting like a sounding board that again amplifies vibrations.
In short, there's maybe the wrong HD make of HD inside, AND likely poor mechanical support for the board and/or the outer case.
Putting a jacket under the deck IS NOT normally needed for hard drive decks having good HD and adequate mechanical design.
Making up excuses for Korg is not going to help sort out this shortcoming with a fix in future models..