Hi AussieWard,
When you suddenly notice larger than normal amounts of usage, I would suggest the following checks:
- Be aware that streaming services such as Netflix, Stan, Presto and iTunes can generate a lot of download usage. Particularly if they are set to High Def or Ultra Def.
- Access the modem interface to see the devices connected to your modem and make sure that there are no unexpected devices.
- Changing the WiFi network name and security key. You can also set the modem so that it doesn't broadcast the network name. You will need to manually update each device that connects to your network with these new security keys.
- Update your internet security software and perform a scan on all devices that connect to your internet
- Shelly