Has been atleast half an hour since first connection issue. The server was already slow during entire day, and the issue seems to have been around 24 hours ago, though I didn't experienced it during that time.

The server responds with 503/502. sometimes page opens super slowly, but soon after, it quickly goes to 503 again.

Error 503 Backend fetch failed, forwarded for 182.211.31.55, 127.0.0.1
(Varnish XID 35694190) via cp3.miraheze.org at Thu, 09 Jan 2020 11:11:09 GMT.

Error 503 Backend fetch failed, forwarded for 182.211.31.55, 127.0.0.1
(Varnish XID 32319553) via cp3.miraheze.org at Thu, 09 Jan 2020 11:21:44 GMT.