There are no error messages, just the site sometimes does not open on the home Internet, while the site is always accessible from mobile.
It's like something is blocking my access to the site.

P.S. This problem is not only with the freebitco site, there are other sites with the same problem. I'm trying to figure out the reasons and find a solution.
Are you using the same phone and just switching from Wi-Fi to mobile internet or is it another device?
Yes, this is the same phone, the site also often does not open on the home computer. I thought it might be a virus, I scanned the system several times - I did not find anything. The site has always worked perfectly on the home Internet, both on a computer and on a phone via wi-fi. Now on the home Internet, the site sometimes works, sometimes it does not open. On the mobile Internet from another Internet provider - the site always works fine.
From that description, I think it is an intermittent fault at the ISP.