There is the UL certification, but I doubt it covers software. That's the crux of the issue, isn't, that _mechanically_ everything is working fine, but something outside of the control of the unit (e.g. spotty wifi, internet connectivity issues) cause UX issues. In the end, whose fault is it?
UL certification is really all about safety, as in a software defect won't cause an electrical fire and burn your house down. They don't guarantee a good user experience.
Well spotty WiFi and internet connectivity issues probably aren't the homeowners fault either...
The fault probably lies with the ISP, the router manufacturer, or someone else. Let the gadget manufacturers guarantee pay out, and they can try to chase the ISP themselves. If the issue doesn't get fixed, they can simply say "IoT doorbell (reliability guarantee excludes use with Comcast)"
