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Simulation becomes progressively colder before crashing (CESM2.1.3 with CAM4 and CLM4)

Hi there,

I've recently been running cesm2.1.3 at resolution f19_g16 with the following compset: 1850_CAM40_CLM40%CN_CICE_DOCN%SOM_RTM_SGLC_SWAV

The slab-ocean forcing file is: pop_frc.b.c40.B1850CN.f19_g16.100105.nc

What I find is that the model becomes progressively colder and colder before crashing after approximately 35 years. This behaviour is surprising, and I'm wondering whether anyone else has seen this using cesm2 and a similar compset?