I've been running CESM1.2 successfully for a while, but recently one of my simulations crashed. If I try to restart it from the last restart file, it runs for a few years and crashes again at the same spot. The relevant error in the cesm log file appears to be:
197:POP_SolversChronGear: solver not converged
197:POP_SolverRun: error in ChronGear
197:POP_BarotropicDriver: error in solver
197:Step: error in barotropic
A search of the CESM forum suggests that decreasing the ocean timestep might help (https://bb.cgd.ucar.edu/node/1001945). I have not tried that yet. That suggestion is from 5 years ago. Is it still the best course of action?