This morning just before 8 am I noticed the sound of my bedroom radiator shutting down whilst aware that it was much to early in the schedule to do so and that the temperature was just under 2 degrees under target. Android app confirmed 'twas closed and any attempt to increase target temperature (even to 25c) had no effect. The app nor the wireless stat controlling the rad could not cause the rad stat to re-open. As can be seen from the following, it eventually righted itself and continued to complete its schedule.
Makes me wonder whether such events could happen more often without our knowledge? But what would cause it?