Electric under floor heating mats were laid in my kitchen two years ago and work fine but for one issue. When the thermostat is in the off mode and there is a power cut, the thermostat will turn on as soon as power is reinstated. The manufacturers felt it was a fault in the thermostat and provided a replacement but this does exactly the same as the original. So far no one has been able to determine why this is happening albeit they all agree that it should not default to on following a power cut. Has anyone experienced this issue before and if so do you have any suggestions. I am not an electrician but did build my own house so have some knowledge of electrical wiring but have never carried out any of the electrical work myself believing this to be something that I would rather leave to the experts but on this occasion even they appear baffled.