Your issue is not wide spread I read nest forums every day and nest is working on a solution. For customers that can't wait for that solution they are refunding your money.
Here is a post from a Nest Engineer on there forums that I quoted:
Apparently some HVAC systems generate electrical noise (voltage spikes) causing the switch transistor in the base to overheat or be damaged. As was stated in the letter there are literally hundreds of thousands of nests out there. This problem is related to relatively a very small number of those.
No I don't work for nest. So don't go there. I have two nests installed in my house now for over 2 years with not one issue.
For you to post here and tell everyone that it is not if but when it fails is inaccurate at best.
Making it sound like all of them are failing when a small number are because of the HVAC units there install on is inaccurate too.
Nest cannot account for the literally hundreds of HVAC systems that are out there. With different control circuits and different architectures. But they are correcting your issue as I write this and Im sure that it will not be an issue in the future, like I said for those that can't wait they are refunding your purchase and you can go back to whatever you were using previously.
Edited by Mechanic - 12/1/13 at 4:09pm