1) If the 1 micrometer layer is on the outside, don't create geometry for that, just create geometry for the other 3 layers, then in Mechanical, use a Surface Coating and pick the outside faces of the layer that the coating is applied to.
2) Don't use Bonded Contact, use Shared Topology. If you are using DesignModeler, pick the three solids and Form New Part. If you are using SpaceClaim, click on the Workbench tab and click the Share Button. When the Geometry update is complete, delete all Contacts in the Connections folder.
3) I assume you have large deflection turned on in the Analysis Settings. You need lots of substeps. Keep the Initial and Minimum Substeps equal.
4) You might benefit from inserting a Command object with the command NEQIT,50 to force the solver to keep iterating for longer than the default 26 iterations before it does a bisection.
5) You may benefit from Reduced Integration on the brick elements. You might also benefit from setting some Keyops on the elements that provide hourglass control.
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