Google Nest Community

I've had Google speakers for years. I've got a small Google Home Speaker and a Nest Audio and about 6 months ago they both went terrible at recognising my voice. Today it's been particularly frustrating so I'm trying to find out what's going on final...

This morning, my Nest 3rd generation thermostat and heatlink suddenly wouldn't talk to each other from about 5 metres away and 1 wall. It's been set up like this for months working fine.I tried reconnecting which failed and kept trying various resets...