Love the innovation of the product. However, for last few weeks nest reports low battery every few hours and then disconnects from wireless network to conserve battery. Once offline, I cannot control it from iPhone and neither can it talk to its servers to leverage the "learning / programmable" feature. Talked to customer service day before Yesterday and had a very disappointing experience.
Customer agent said it is owing to Apple Extreme / Express router. He further claimed that Apple routers are not compatible and result in faster battery drain. I used nest with Apple router for ~5 months without issues and now am being told problem is router. He was not willing to entertain another logical explanation that the lion battery inside nest had simply lost capacity to hold enough charge, a common occurrence with rechargeable batteries.