Transient simulation - adding noise after steady state

Hi,

We have a fairly large mixed-signal block, where we would like to get some transient simulation data with noise. However, to save simulation time, we would like to run up to steady-state first, without noise, and then add noise and simulate for some more time.

I did run a transient simulation with a save snapshot after steady state - however when I try to restart, it fails with a SimError (and seemingly nothing in the logs?) - I probably messed something up, allthough I am not entirely sure on what. I have two questions:

A) Is this snapshot saved somewhere, so I can try and save it for future use?
B) Is this method at all possible? Before I try and redo the transient steady state simulation (7 days of sim time) I would like to know if this is the most effiecient approach?

BR,
Christian

Virtuoso IC6.1.8-64b.500.20
Spectre 20.1.0.298.isr9
Xrun 20.09-s008