how could FLAC3D simulate the deterioration of soil when coupling with TOUGH

I am read many essay about FLAC3D+TOUGH, including FLAC3D+TOUGH2 and FLAC3D+TOUGH+HYDRATE, and i have completed the couple with FLAC3D AND TOUGH+HYDRATE, I have several question about FLAC3D when i am learning. Generally, we need to set an unbalance force to make it run, and the changeable pore-pressure can induce the FLAC3D to run continuously when coupling with TOUGH.

But, when we simulate the process of dissociation of hydrate, the dissociation of hydrate will induce a lower strength of soil, hence the soil will have some deformation  in that condition. However, I find that FLAC3D seems can't simulate that condition, when the unbalance force of model in FLAC3D is already convergent, it will not continue to run when the Bulk modulus and Shear modulus change, it shows as follow:
   

and in console we can find that there are only 1 cycle in process 2 because the unbalance force is already convergent

So, i want to know if there are some wrong when i am using FLAC3D, or it is a unsolved question on FLAC3D+TOUGH+HYDRATE.