rss feed sometimes returns 404 error, sometimes not

I can only get my rss feed to open maybe one out of every 4 times. The rest of the time I get a 404 error.

The address for my blog: https://perspicacious.org
The address for my rss feed: https://perspicacious.org/wp-rss2.php

I’ve been through the posts here over and over again, but have not seen anything like the problem I’ve having.

Thx in advance for any help.