Your dealer may be partially correct and partially full of BS. Shocker!!!
I have seen situations where the subplate does not sit flat to the table after some time due to a buildup of the coolant that has dried underneath essentially lifting portions of the plate. As much of a pain this will be with a VF-10 sized plate, remove your subplate, clean and stone the machine table. Verify the table is level and has no twist in it, very important. Then machine both sides of the subplate, just to humor the HFO.
I would probably bet that your parts will come out like they were when you first set up the machine after doing this.
Good luck and keep us posted!