Jetpack Stats issue

I’ve been using WordPress on my self-hosted site for a year now and haven’t had any problems, but over the last few days, I’ve not been able to get Jetpack Stats to work. When I click on ‘Site Stats’, the page appears, but the ‘loading’ image just keeps on spinning without ever actually loading the page. I’ve not updated anything as far as I’m aware, and when I try to reinstall WordPress, that install page loads with just the title and nothing else appearing.