explosions are too much energy in the settings – or you are encountering unstable solutions
— From the Help “The classic Soft Body variation with the 3 Spring types mentioned above tends to lose its initial overall shape because each object point’s Spring only “sees” its direct neighbor. The Stiffness values can be increased dramatically but this would result in the simulation becoming correspondingly unstable, which would in turn have to be compensated for by increasing the Steps per Frame value, resulting in higher memory requirements.”
that’s just one example talking about Shape Conservation and the help has a number of places where it talks about pushing a setting to far will result in unstable dynamics, so *maybe* increasing Steps Per Frame will help but not necessarily – it would depend on how it’s set up and what settings you are using.