Note: this support article will help you troubleshoot 'No Response' issues that happen even when you're connected to your home Wi-Fi network. If you only have 'No Response' issues when you're away from home, please see this article instead.
Starling Home Hub is designed to run 24/7/365. It is self-healing, automatically handles and recovers from issues with the Nest service or with your Internet provider, and should never need rebooting or restarting.
If your hub is not 24/7 stable, even when your iPhone is connected to your home Wi-Fi network - for example, you sometimes see 'No Response' on the Nest device tiles in the Apple Home app - it means your network is not set up correctly.
If you are using a separate modem and router, your Starling Home Hub (along with all other Ethernet devices) must be connected to your router, not your modem.
If you are using a mesh network like Eero, Google Wi-Fi, or a Wi-Fi range extender, your Starling Home Hub (along with all other Ethernet devices) must be connected to your gateway router, not a satellite router or range extender.
If you do not have enough Ethernet ports on your router to accommodate all your devices, you will need a switch, for example, the Netgear GS308. Connect your modem to one Ethernet port on the router, and your switch to another Ethernet port on the router. Then, connect all other Ethernet devices to the switch.
What to do if you still have issues
Starling Home Hub (connected by Ethernet to) router model XXX (connected by Ethernet to) cable modem model YYY
iPhone (connected by Wi-Fi to) router
Also, please tell us if the issues you are having happen only when your iPhone is connected to your home Wi-Fi network, only when away from home, or both.