Nest owners have reported that their smart thermostats have stopped working and as a result many woke up to colder than normal temperature in their house and unresponsive completely dead Nests. The fault lies in a software update (version 5.1.3 or later) that was pushed out to devices in December that drains the battery and ultimately shuts down the device.
I don’t recall the last time my heating system developed a bug, never mind one that was introduced by the manufacturer after they sold it to me. If a remote software update can turn your appliances off, can they turn them on? And if your microwave or oven is net-connected, then can someone turn it on when you’re asleep?