AO Crashing Sketchup / Freeze wheel

Hi , My Ambient Occlusion was working fine up until a couple days ago. Every time I use it in my model, I get the spinning wheel. The model has not gotten much bigger, I have also restarted my computer several times. My next step is to reboot the internet. On a job deadline and at a loss - taking any suggestions.

Hi, if try to reduce the size of the model, by deleting the heaviest elements, does that help?

Please also keep in mind that if the model is large, the first time you press the render button, it might take a while to start rendering. If will be much faster after that.