Long simulation errors

Hi,
I have some long simulations to run and to get realistic resuilts I need to keep the timestep small.
I am getting simulation failures with 'internal simulation error'.
If I remove some variables it can go longer.
After the failure if I open the grapher it tries to graph the data but halts and restarts every 6-8 seconds and starts over -forever.  Each try it is able to plot some varying amount of the data.  The data is very good with the small timestep as opposed to longer timesteps, but it does not seem MS12 can handle the amoun tof data.
What are the limitations?  How many samples of how many variables can I accumulate and still have the simulation and grapher work?
Thanks.

I tried the recorder, but is seems to only take up to four signals.  It also hangs MS after closing the configuration panel.
I have had better luck just saving a segment of the data I want.  i.e. I run a 50msec simulation but the first 40 msec is start up activity.  I tell MS to simulate 40-45 msec, and though it simulates the full interval it only stores the segment of data requested.  The grapher can then handle that.  At least it could until I tried to turn on sample display.  Then it never recovered and I had to kill MS and lost my overnight simulation data. :-(
The fine timestep simulation data is vastly more accurate than default timesteps or other values suggested in the forums.
I should think there should be a simulation option that forces finer timesteps when signals are active and stretches them out when static.  If I just set the simulation tolerances tighter does this do that?
Thanks,
David B

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