520 error some users

Hi, My website sometimes gives error 520 and this happens to certain users. If I change the domain name the problem is solved. However, access to the website via ip is always available and hassle-free.

https://.com/cdn-cgi/trace result.
fl=189f77
h=
.com
ip=**
ts=1633507479.418
visit_scheme=https
uag=Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/94.0.4606.71 Safari/537.36
colo=IST
http=http/3
loc=TR
tls=TLSv1.3
sni=plaintext
warp=off
gateway=off

What’s the domain? You could additionally take a look at this tutorial: