Netlify automatic builds stopped working


I have automatic builds turned on, and it has worked for years however somewhere last week the automatic builds stopped working. I didn’t change any settings, so its quite odd that they’ve stopped working. I now have to manually trigger a build after every change. I’ve screenshotted my build settings below. Any ideas on why it stopped automatically building?

Issue fixed, I just turned off automatic builds and turned it back on again.
That seemed to have fixed the issue. (a true classic)