Have you tried scaling the time step and delete any misbehaving SPH node:
These options let you set SPH cutoffs.
The default values are usually good if you are using the default units (mm, mg, ms). You may want to change one or more of these defaults if you are using some other set of units.
Limit density / Delete node
If the density of an SPH node drops below the minimum density or above the maximum density defined by the minimum and maximum density factor chosen for the material, you have the choice of either limiting the density to the cutoff density or deleting the node. Make your choice here.
Nodes that have a timestep below the minimum timestep will be deleted.
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