A good remediation for convergence issues is to force the solver to take many substeps. That means setting the Initial and Minimum Substeps to have a large number like 100 or 500 etc. Maximum Substeps should be 1000.
Another remediation is to allow the solver to continue iterations for more than 26 before taking a Bisection by adding the Command object with the code
NEQIT, 100
which will allow the iterations to go to 100 (or 500).
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