John Doyle
Ansys Employee

The only way to eliminate these warnings is to remove all the sources of nonlinearities.

However, keep in mind, these are only warnings.  The message advises you that if the topology results are converged and conditions are met, perhaps the result is acceptable, but check it carefully.    If you are not sure, try taking the topolgy result into a new analysis system and perform a validation simulation to confirm that it is acceptable.  You might be ok.