I have support access on for aficreditsolutions.com. The site gave a gateway timeout when I told hummingbird to clear cache.
I noticed this in the error log. not sure if this relates to it:
[Fri Nov 08 13:38:07.568280 2019] [:warn] [pid 22551] [client 220.127.116.11:59236] Timeout waiting for output from CGI script /home/agelafin/public_html/aficreditsolutions.com/wp-admin/admin.php, referer: https://aficreditsolutions.com/wp-admin/admin.php?page=wphb