System Coupling shows that simulation is running but no progress is being made

I am running a two way FSI in workbench. When I start the simulation it runs without any errors. I do get the warnings in the screenshot below. The simulation will run for about two hours, making progress, then it just stops. It looks like it is running but no progress is made. I've left it running for hours and it won't make progress. I have tried lowering the number of iterations and and simplifying the mesh but it still gets stuck. In the second screenshot below you can see that it is stuck at 68%. It took about 2 hours to get to 68%. Then after 2.5 hours it is still on 68%. Thanks for your help!


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