Something I've noticed over the past few days is that sometimes Sylestia returns a 'your connection is not private' chrome page. This happens around 11PM sylestia time, and has occurred two consecutive days (29th-30th). The site is fine again in the morning/hours before.
(maybe it's the universe telling me to sleep?)
(Edit: happened again tonight. Only on my laptop.)

What are you trying to do when this pops up?

By chance, is it when viewing something on the Forums? If so, it's possible someone has posted a non SSL link to some other site (like an image or something) and your browser is then triggering the warning.

I'm trying to load Sylestia.com, nothing more. I rebooted the computer and it's seemed to have resolved itself. This issue also happened when I tried to load Howrse.com, so I think it was on my end - possibly something to do with my school domain. :/

Hm. Interesting. Yea. I'm not sure what our home page would be doing that would trigger such a warning. The only thing I can think of is it flagging our Google Analytics? That's about all the home page has that isn't related to our domain/static HTML.