Try this with a live OS booted from USB/DVD. No OS install required but can be useful to determine if your installed OS is infected or other.
OK so I live with a roommate. We both have desktops built to game and use ethernet cords to connect our computers to the Ubee modem. We pay for 50 Mbps down and 5 Mbps up. He has no problems with internet. We both play League of Legends and I will randomly lag by getting disconnected for a brief moment and reconnecting (could last anywhere from 5 to 30 seconds on average). This doesn't just happen when playing games, it could be while browsing YouTube, Facebook, etc. Could anyone please help me with this? Thank you in advance!