Export MOV taking too long

Hi,
I am using Harmony Advanced 17 and every time I try to export an mov, the program goes into not responding mode and when it does come back to render out, it takes way too long. I only have 4-5 layers, a small audio clip, frame rate is 300, and there are no effects or camera moves. This just recently started to happen and it was not an issue in the past with much larger file scenes I’ve exported. I have not changed any of the export setting either, so I am not sure what happened to the software to make it lag like this.
Any suggestions?