Smart thermostat turning itself off

Hi all,
My tado has been working fine for over a year.
Over the last few weeks however it is turning off before my rads heat up.
It also happens on manual control.
It will come on and then after about 5 mins or less I can hear the relay click and it will turn off.
According to the app and the display it should be on as I've set temp to max and current temp is about 17 degrees.
Is it a sensor issue?
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