Hey @jvarkevisser!
Glad that it worked! 
Well in a meantime I was always trying to run your case. It seems like you were having the problem with your geometry. The created mesh had some orphan nodes which were not belonging to the mesh. I think in my case the application of elastic support was always on these nodes somehow. Whereas, you were probably lucky to run it without any problem.
So I exported the mesh, removed the orphan nodes but still remained with the multiple overlapping elements. Opening your geometry in one of our CAD tool reveals that one of your spring face was distorted. I think this was the problem. I created a new spring and imported it to check if it works. It did start working but the solution wasn’t stable that much.
On the other side, doing a static test simulation revealed that your plate is quite thin and your spring is having the same material as your plates, this makes the plates to bend if the pressure is applied over it. Either your spring needs to be softer or you can apply a displacement boundary condition on top surface to avoid this bending of the plate. In the real world case also I think these plates are connected to some system which don’t allow them to bend in any direction.
I will try to converge the solution an will return with some results.
Best,
Ahmed