Nest E thermostat screen of death ?

[harbottle]

Hi, I have a wireless Nest E thermostat and it has worked fine for 4 years but a couple of days ago it went offline and it now has a picture on the display as shown in the photo, no matter if I switch off and on it is completely unresponsive. Has anyone come across a similar thing and do you know how to rectify it please.
Thanks

 

[harbottle]

Update, I have now sorted this problem by uninstalling the thermostat and heat link and then reinstalling them, jobs a good un.

Thanks for looking anyway.

 

[ianmcd]

This sometimes happens if the mains power to the receiver is interrupted