Full disclosure: I no longer live in an area serviced by Sonic, but I still use the Sonic hosting and domain services. There's a great braintrust on the forum, and I'm hoping to leverage it.
My current ISP's router allows me to manage it remotely, and it even sends me alerts when a new device gets connected. We're away from home, but I got an alert that an "unknown" device joined the network.
I looked up the Mac address of the device, and it's assigned to Ralink Technology Corp., who appears they make Wi-Fi chipsets for various devices.
The people whom I've given the password (there are only a couple) haven't been visiting, so I'm unsure what device could have connected.
Currently in the house are some smart TVs, some Amazon Echoes, some Google Nests, an ecobee thermostat, an iAquaLink pool controller, and a MyQ garage door opener. No computers, phones, or tablets are connected at this time.
I thought about changing the Wi-Fi password, but that would immediately disable all the devices. In particular, we need to maintain the ability to monitor the pool and thermostat.
I've "paused" the device so it currently shouldn't be able to communicate through the network. However, if someone really is trying to access, they simply can get another device.
Should I worry about vulnerabilities with the devices that are still active in the house? Should I take any other steps besides monitoring for any future unknown devices? ...thanks!