when trying to make a reply earlier today (#49405), about a minute or two after clicking POST I finally got:
Internal Server Error
The server encountered an internal error or misconfiguration and was unable to complete your request.
Please contact the server administrator, firstname.lastname@example.org and inform them of the time the error occurred, and anything you might have done that may have caused the error.
More information about this error may be available in the server error log.
Additionally, a 500 Internal Server Error error was encountered while trying to use an ErrorDocument to handle the request.
The post was made, but my browser never received the page reload.
(and again when I tried to make THIS post)