A network change is typically detected when there is a change in the IP address, MAC address, or both. This can happen for a variety of reasons, such as when a device is moved to a different location or when a new device is added to the network. In some cases, a network change may also be caused by a problem with the router or another piece of network equipment. If you suspect that a network change has occurred, you can check the IP addresses and MAC addresses of your devices to see if anything has changed. You can also try restarting your router or other equipment to see if that resolves the issue. If you're still having trouble, you may need to contact your ISP or network administrator for help.