Hi David64,   Thank you for your help. Turns out I had a hardware fault. I did a factory reset of the router and enabled the option that shared data with Google ( I normally don't enable these things). Seems like they looked at the data and contacted me to offer me a replacement router. I have the new router now and it is working without issues for about a week now.    Email from Google started like this - "We're committed to building products that deliver helpful solutions for your home and work the way that you would expect. So we want to let you know that we've identified an issue with your Nest Wifi Router (serial number*: XXXXXXX) that may cause it to reboot several times a day and disrupt your Internet usage. Unfortunately, our testing indicates that this problem might worsen over time". ... View more