As you say it has only just started I need to ask are you ethernet or wi-fi. If you are wi-fi have you used the security number ( not password ) to lock you connection as secure. If you have not then somebody could be using your hub/router without you knowing. Do you have an games such as the team fortress or warframe. a lot of games have a built in latency checker and if the figures suddenly alter it could be a sign that somebody has hacked your connection. If that's the case and the authorities knock on your door ( it does happen ) you will have a hard time proving that it was not you ( via your set up ) that was doing some illegal.
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