I am glad that you were able to work things out. The default setting for convergence is for the residuals to fall below a threshold of 1e-03. If there is any unsteadiness in the flow, the residuals generally start oscillating. This behavior is usually the cue for conducting a transient analysis to check for the cause of unsteadiness. If you know for a fact that you should get a stead-state solution, but the residuals are flat/oscillating instead of monotonically going down, I would recommend reducing the under-relaxation factors for the 'higher' residuals and checking if that helps stabilize the simulation and take it to convergence.
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