[cam-users] error with DIF4

[e.k.]

Dear CAM users,

I am trying to run the CAM3 version for T85 with another set of input 
data for ncdata  "cami_0000-09-01_128x256_L26_c040422.nc" but by keeping 
some of the variables like LANDM_COSLAT from the demo file. The model 
starts to run but after a few timesteps it stops caused to a problem 
with the horizontal diffusion parameter dif4 (it gets values higher than 
1.5 while running). The values set in the namelist for dif2 and dif4 are:
dif2 = 2.5e05
dif4 = 1.0e15

and several other compinations with no luck.

Do you have any suggestion for this error?

Thanks in advance.