Service Unavailable messages, and wrong formatting in Library Catalogue

We're having issues with this error message appearing when trying to access many of our resources, including DISCOVER.

If this happens to you, please try refreshing the page. The fault is intermittent and we are working on finding a solution.

We are also finding that the library catalogue page is not always displaying correctly, e.g. like this:

Again, if you see this, just refresh the page and it should go back to normal.