I’ve been having this issue for nearly a year now. Basically what happens is that I get a red exclamation icon on my screen which lasts about 5 seconds and then it kicks me out of the game. It says “lost connection to game server” and then puts me back into the main menu and I can reconnect fine. Nothing else goes offline like Discord, Chrome, etc. just Overwatch. I have a YouTube link that shows the issue in one of my ranked games if any developer would like to see the main problem.
I have absolutely no idea what causes this but it’s been happening nearly every play session, oftentimes more than once. I am using an ethernet cable, so it’s not a wireless issue.
So there’s a bit of lag in the peering partner that AtlanticBB uses, their name is Twelve99. There’s nothing you as a customer can do about that other than tell the ISP this is happening. As for a disconnection, I don’t see one in this test.
When it comes to the IP renewing, you may need to call the ISP and ask them to disable it (if they can).