I have the same problem on only a few of my sites: the updraftPlus dashboard is unavailable. Safari presents me with a timeout or ‘dropped the connection’ and failed to open the page.
I already reinstalled and updated the plugin, deactivated most or all of the other plugins but nothing works.
I thought it could have something to do with the caching settings (wp-rocket) and the possibilities to combine scripts or put them at the bottom of a page but deactivating this plugin was no solution either.
Any help is welcome.