From Frontier:
"Thank you for providing all this information for us!
Having taken a look into the net logs the issue appears to be due to UPnP failing, this is the connection method we utilise here at Frontier for allowing users to connect to one another as such if this is not something that is enabled you can expect to see disconnection errors.
Secondly, it also appears as though while you do indeed have IPv4 enabled it is not using a static IP address which will often lead to further disconnection issues.
As such to correct these two issues can you head into your router/network management device settings and look for a UPnP option and the ability to utilise a static IP (enable both).
If these options aren't displayed to you then you may need to reach out directly to your internet service provider to ask for these to be enabled as we have seen in the past that these settings can be held at ISP level.
Please do let us know how this goes!
"
Yeah. So why everything else is working perfectly? And this connection method has been is use for me, since I started playing, almost TWO YEARS AGO.
So they move the blame here, and not to their patch?
What on EARTH they changed, that caused such a clusterfu*k for so many paying customers? Seriously!
And yeah. For some 4G ISP's, you need to pay in order to have a static IP (like is the case with mine). So fu*k you very much FDEV.