On my site dev.yptr.ml I often get the errors 520 and 521, but I already checked that cloudflare is supported by my hoster. When I tried to use full SSL encryption it also failed sometimes. The thing is that most of the time everythings working fine, but than there is one error after the other (sometimes there is an error just for one file. So the site is loading, but without css as example).
I already checked if the server is really offline when cloudflare said so, but it’s not.
Do you have any idea why this happens?