My client has alerted me they are receiving this message when trying to access the site
An Error Was Encountered
Site Error: Unable to Load Site Preferences; No Preferences Found
The site is v2.5.3 - Build Date: 20120911
They say they are now able to access the site however I am rather concerned they got this message at all.
This site was developed from scratch with v 2.5.3 so there have been no updates.
Any ideas what could be causing this error to only appear temporarily?