Who hasn't experienced this? The phone rings, the website doesn't seem to work anymore (or our monitoring has already detected it for you), even though at first glance no one has changed anything on the website.
Maybe it's because of a new PHP version that the hoster installed overnight?
However, it is difficult for most of us to track when which hoster updated which PHP version for which customer. And that is exactly why we have built in a version history. So you can see at any time when the PHP version of a particular installation has changed.