While loading a new component on the site, the site is down

Many Components only support the latest commit (or thereabouts).

5 months is a long time not to have updated your site. Updating every one-two months is probably a better regime, especially if on tests-passed

If you have installed a new Component, it may not be compatible (there may be associated errors in the javascript console of the browser?).

Upgrade your site as per your screenshot as a first step to resolution:

If that doesn’t work, disable components temporarily and remove this one: