Maybe related to their scheduled maintenance? https://www.cloudflarestatus.com/

I thought that as we're seeing issues with LON, but their Manchester POP is also down and that didn't have any maintenance this morning.

From the Cloudflare status website: "Scheduled maintenance is currently in progress." Maybe something went wrong while doing maintenance?

They consistently have scheduled maintenance.

Is there anything that can be replaced on a MacBook?

Not really. You used to be able to replace the SSD (albeit with another proprietary module), but even that is soldered down as of a few years back

`site:news.ycombinator.com keyword` on Google