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cesm failed to converge

I build a cesm case use B2000CNCHM compset, its chemistry is superfast and it works well. However, when I add several BC tracers in it, it crashed at the very beginning. In the cesm.log reports thatimp_sol: Time step   1.8000000000000E+03 failed to converge @ (lchnk,lev,col,nstep) =    493     8    14     0 imp_sol : @ (lchnk,lev,col) =  imp_sol: Time step   1.8000000000000E+03 failed to converge @ (lchnk,lev,col,nstep) =    241    15    16     0          493            8          14  failed  imp_sol: Time step   1.8000000000000E+03 failed to converge @ (lchnk,lev,col,nstep) =    313     9    15     0 imp_sol : @ (lchnk,lev,col) =           313            9           15  failedI have successfully run a same case use BMOZMAM compsets and add same tracers in it.So, I wonder know how to solve this problem?What's more,I once try to combine the CAM5 with this super fast chemistry ,but it crashed after a few hours as I have mentioned beforehttps://bb.cgd.ucar.edu/running-cesm-out-memoryso,I wonder that is there some potenital bugs with this superfast chemistry used in cesm? 
 
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