So I wanna preface this with this: I'm thankful that everyone was caring and offered lots of help and showed a lot of concern for the site.
We weren't hacked, DDoSed or anything like that really. We just experienced a symptom of old age it turns out! To get into a bit of technical stuff, we actually lost both of the main hard drives (SSDs) in the main web hosting server on the same day. To put this succinctly: This kills the server. After spending a day diagnosing the issue, the ops team and I were ready to submit the case to our hosting provider OVH and let them start replacing the parts.