Discord has identified the problem and seems to have remedied it. More information can be found here: https://discordstatus.com/incidents/pcg3nsfq6l2y
Thank you for your patience.

Due to partial outages with the Discord API, some of our services may be unavailable or adversely affected with slow response times. We do not currently know when this will be fixed, but will provide updates as the issue progresses. We apologise for any inconvenience caused.