I have been using a Sunvic wireless thermostat for approx 5 years. I recently changed the batteries and all seemed fine. However it has now developed a life of it's own and randomly switches on the heating in the middle of the night, settings still set to nighttime ie off. Subsequently it also refuses to allow any changes go settings and is generally throwing a wobbly! Do I need a new one and if so will it work with my current receiver.? Thank you
