2D Solution went unstable twice

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2D Solution went unstable twice

bcahill
Has anyone ever had a 1D/2D model run for a long period of time and then suddenly go unstable without any results being written to the 1D *.O## output files?  The *.hdf file for the associate plan contains data just prior to it going unstable.  In my case the model simply says that the 2D Solution went unstable at 27MAR2010 02:23:58 but it also says that the simulation went unstable at 11MAR2010 23:58:39 which is during the warmup period.  How can a model go unstable in the warmup period and still continue to process only to go unstable again?

Aside from the sudden instability the model was running rather stable.