I am having the same problem. When I start editor about 10 mins later internet page loading takes forever so internet dies. I started offline mode even closed the launcher when using the engine, also unplugged my ethernet cable and disabled/enabled the adapter and restarted the modem. Nothing helped except for closing the editor and then in 2-3 minutes internet turned back to normal. That’s a pretty weird, not sure what causes that.
my maindobard has amd760g chipset with Realtek 8111D/E ethernet chip.
using amd phenomII x4 955be 3.2ghz cpu and radeon 7890le tahiti gpu.