"Failed to load series from API" Error

Sonarr version (exact version):
Mono version (if Sonarr is not running on Windows):
OS: Linux Gentoo 2.7
Debug logs: N/A
Description of issue: The error randomly shows up when I try to access the Sonarr page. However, sometimes I can access the page without issues.

Sonarr Trace Log: https://pastebin.com/1PHivcCj

21-1-3 19:47:32.0|Trace|Http|Req: 7 [GET] /api/v3/series (from 112.*.*.159 Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:84.0) Gecko/20100101 Firefox/84.0)
21-1-3 19:49:20.6|Trace|Http|Res: 7 [GET] /api/v3/series: 200.OK (108586 ms)
21-1-3 19:49:20.6|Debug|Api|[GET] /api/v3/series: 200.OK (108586 ms)

It took a little under 2 minutes to respond successfully, if you’re using a reverse proxy make sure it’s not timing out earlier than that (or too quickly in general).