HFSS coplanar waveguide

I?m simulation a Grounded CPW in HFSS v13 and getting invalid results near 15GHz.

NOTE: Solid lines are simulation results, dotted lines are measured results in the lab.

I assigned waveport width to 4xLineWidth, waveport height to 4xDielectricHeight

Simulation specifies "NOT CONVERGED"

Any suggestions are welcomed.

GCPW.zip