Why does home beeline "sometimes" block stackoverflow.com?

Question

stack overflow

I did not find the reasons in the registries. I checked both the IP and the domain, there is nothing on them. But for the second or third day, the beeline sometimes resolves the so domain into its IP - 85.21.120.85 RU-CORBINA SARATOV BLOCK (judging by the name, blocking)

traceroute to stackoverflow.com (151.101.1.69), 30 hops max, 60 byte packets
 1  192.168.0.1 (192.168.0.1)  0.236 ms  0.249 ms  0.295 ms
 2  XXX-XXX-XXX-XXX.broadband.corbina.ru (XXX.XXX.XXX.XXX)  1.166 ms  1.164 ms  1.175 ms
 3  * * *
 4  * * *
 5  85.21.120.85 (85.21.120.85)  1.761 ms  1.763 ms  1.738 ms
.......
30  85.21.120.84 (85.21.120.84)  2.697 ms  3.089 ms  2.566 ms

With what it can be connected and who if what is worth pulling?

Answer 1

Here only beeline can be pulled, apparently they have some kind of jamb with blocking certain addresses