Why won't a particular site open?

Question

WiFi

Recently, the steam site has stopped opening for me. In DotA, when you press search, the key stuck and the search did not start. After some time, everything got better for a while, but then it happened again. With VPN, the site works fine, but there are still problems with DotA. I already decided to change the poppy address by typing. Helped. The problem was solved both with the site and with DotA. For two days. Now exactly the same problem. I don't know what is the reason for it. I even reinstalled Windows to no avail.
I will be glad to help. Thanks in advance.

Answer 1

Change DNS to third party.
For example - 1.1.1.1 ? 1.0.0.1

Answer 2

Calculate mtu or ask your ISP.

Answer 3

If changing the MAC address helped, change it again, then again. I don't know why it helps you, but you should at least find out if you can repeat the "treatment" of the problem in this way. If this happened once, perhaps it was not the poppy address.
We are waiting for news from you.