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Hi
Do not exactly why that is (make sure to use modal super pos. and base excitation – acc. based is most logic or perhaps common I would imagine – set displacement to relative base – stresses are the most important anyhow ).
For another point you do not need 3400 steps 🙂 – just use 1 substep with a global time step of 0.25 ms in one single step that lasts for the total simulation time – see here for diff., between steps and substeps.
https://www.padtinc.com/2011/11/08/you-dont-wanna-step-to-this-breaking-down-loadsteps-and-substeps-in-ansys-mechanical/
We also have a course on dynamics which I would suggest (it is free and on our website here)
All the best
Erik