It's going to be hard to answer this without a little more information, so if you can upload the model that might help.
That said, the general principle here is that your model conditions are changing extremely quickly. Whatever solver you're running is an variable-step solver, and it's controlling the step size to minimize error. These solvers all compare multiple numerical methods to each other for the same starting conditions, and if they don't converge on a solution the solver will reduce the step size down to a certain minimum.
If the numerical methods aren't converging for a step size of 1e-13, there is likely something very strange happening at t=33. Perhaps you're generating a random number which is different every time any solver is invoked (though we take steps to prevent this when using our own random number sources in Simulink), or there's some other input to your model with very erratic, nonrepeatable behavior, which turns on at t=33. So, without seeing the system, my advice would be to see whether any condition changes at t=33, and if any of the inputs at that time step look erratic or nondeterministic. You should be able to attach scopes to any point in the model and see their behavior up to the simulation halt time of t=33.
Also, the suggested actions include opening the Solver Profiler. Have you tried that? Did it give any more information on the issue?
