(Tested with Destiny 2 and TF2). I have an ethernet connection, but about 5 minutes into the game my connection goes from perfectly fine to actually nonexistent. The symbol even changes to the monitor with the X, showing no connections. When I close the games, however, the problem disappears. I've tried turning off the "turn device off for power" option. We've installed a new router recently but even that hasn't fixed any problems.
Network adapter: Realtek PCIe GBE Family Controller
OS: Windows 10 Pro Version 1803 Build 17134.285
Update: I've done some more testing, it seems to only disconnect while I'm in an online game itself (which, the campaign is part of), and it switches between connected and not connected a couple of times until I just lose full connection to the server, in which my internet stays connected indefinitely (or at least, until I connect to the servers again)
Update 2: I do want to say that this problem has started recently, and that my internet worked perfectly fine before. This happened about a week or two after my move into my new house.
Network adapter: Realtek PCIe GBE Family Controller
OS: Windows 10 Pro Version 1803 Build 17134.285
Update: I've done some more testing, it seems to only disconnect while I'm in an online game itself (which, the campaign is part of), and it switches between connected and not connected a couple of times until I just lose full connection to the server, in which my internet stays connected indefinitely (or at least, until I connect to the servers again)
Update 2: I do want to say that this problem has started recently, and that my internet worked perfectly fine before. This happened about a week or two after my move into my new house.