Plutonium

Hello, I have no problem playing Black Ops 2 when I enter the server, but after about 10 minutes it exits the game and says that the connection with the server has been lost. I opened the ports I deleted the game and reinstalled it, but the problem was not solved. When I turn off the modem internet and use the mobile internet, the problem is solved. I reset my modem and set it again, but it still didn't work. What should I do now? With ADSL internet, even the launcher site does not open, but there is no problem with other internets

@GhXst-exe I have the same problem
After about 10 minutes, it disconnects from the server