Server cannot be reached from some devices and networks

Unable to connect to my server on some devices and network. While there is no problem on one device or the network, the website does not open at all on another.

When I try to curl I get this message from 1 of 10 curls, other 9 is

curl -I https://mydomain.com/
curl: (35) error:02FFF03C:system library:func(4095):Operation timed out

Or:

curl -v https://mydomain.com/
* Trying 128.199.34.16:443...
* Connected to mydomain.com (128.199.34.16) port 443 (#0)
* ALPN: offers h2
* ALPN: offers http/1.1
*  CAfile: /etc/ssl/cert.pem
*  CApath: none
* (304) (OUT), TLS handshake, Client hello (1):
* error:02FFF03C:system library:func(4095):Operation timed out
* Closing connection 0
curl: (35) error:02FFF03C:system library:func(4095):Operation timed out

Other success curls:

umid@Umid-MBP ~ % curl -I https://mydomain.com/
HTTP/1.1 200 OK
Date: Wed, 01 Mar 2023 13:57:55 GMT
Server: Apache/2.4.41 (Ubuntu)
Set-Cookie: PHPSESSID=tp1ka9nalqqfa639idjtoa8ogv; path=/
Expires: Thu, 19 Nov 1981 08:52:00 GMT
Cache-Control: no-store, no-cache, must-revalidate
Pragma: no-cache
Link: <https://mydomain.com/wp-json/>; rel="https://api.w.org/"
Link: <https://mydomain.com/wp-json/wp/v2/pages/14921>; rel="alternate"; type="application/json"
Link: <https://mydomain.com/>; rel=shortlink
Content-Type: text/html; charset=UTF-8

Sometimes it happens and sometimes not.

I disabled ufw and fail2ban to check If they blocks but no change.

Ubuntu 20.04 / Apache2