Neo Stat User

I had 7 of v1 Neostats installed about 7-8 years ago for temperature reading in a 9-zone heating system (2 zones use 1-wire temperature sensors). None of the 7 work all the time anymore: 5 have died at various points in the past 3-4 years after brief power cuts (screen totally blank), 2 of these start showing "--" for temperature after heating has been switched off for a day or so (if I leave the house for holidays so heating would only kick in if temperature went too low, so as to cause damage to the fabric of the building so to say - frozen pipes etc) - the thermostats fail to show the temperature much earlier than the temperature falling too low. These two then start showing the temperature reading figure again instead of "--" when the house has been warmed up sufficiently again (when it's quite toasty again for some time). This is a product which has failed to report room temperature consistently, I'm not even using it for anything other than to provide temperature readings to my heating system via the Heatmiser API, so it's fundamentally not fit for purpose.