I spoke with Fuji who have suggested making changes to the auto sleep modes so that the camera shuts down when not being used. They also suggested pulling out the lcd screen slightly to help with airflow. I am going to try the auto sleep settings but I’m not convinced they are going to help if taking a reasonable number of photos within half an hour.
I have ordered an alternative brand to test as a possible change. However I was very impressed with the images I was getting from the camera so I’d like to keep it if I can solve the heat issue.
I hope you manage to sort yours too.