I’m getting constant (10+ per day) notifications on my phone that “your hub at home is now online”. I’m not getting any that it’s offline. I’m not getting any notifications from my other devices with similar monitoring that they’re going offline or online. My connection is a rock-solid fiber connection that isn’t going down.
Maybe the Ethernet cable is going bad between the ST hub and your rock solid fiber connection. But best that you contact ST support and let them investigate for you.