domain blocked a gateway

Hi,

I have an issue accessing my domain (site.aghriss.net and cloud.aghriss.net)

I've tried disabling the firewall, disabling Advanced Security, but nothing.

When I restart my router, I can access the domain for a few minutes, but then it gets blocked at the gateway. Here's the traceroute when I can access it:

traceroute to site.aghriss.net (185.27.133.5), 30 hops max, 60 byte packets
1  _gateway (10.0.0.1)  3.991 ms  3.937 ms  6.157 ms
2  cm-1-acr05.boulder.co.denver.comcast.net (96.120.12.133)  23.473 ms  23.449 ms  24.421 ms
3  ae-251-1227-rur101.boulder.co.denver.comcast.net (96.110.195.61)  24.405 ms  24.821 ms  26.607 ms
4  ae-29-ar01.denver.co.denver.comcast.net (162.151.50.249)  26.594 ms  26.850 ms  27.592 ms
5  ae-13.edge8.Denver1.Level3.net (4.68.63.165)  27.577 ms  31.359 ms  31.345 ms
6  ae-4-4.bear1.Manchesteruk2.Level3.net (4.69.167.41)  149.532 ms  145.466 ms  145.041 ms
7  WILDCARD-UK.bear1.Manchesteruk2.Level3.net (195.50.121.134)  148.113 ms !X * *

And the traceroute when it's blocked

1  _gateway (10.0.0.1)  2.783 ms  3.739 ms  5.822 ms
2  * * *
3  * * *
4  * * *
5  * * *
6  * * *
7  * * *

Any idea how to solve this? (it's not an SSL problem, since you can see I could access it. Not a firewall problem, because the same issue persists when disabled.)

Thanks