Hi. For an hour or so every fewf days the red 'high temp freezer ' light appears. After a while it goes off. Sometimes the food feels like it is not quite a frozen as it should be. When I first noticed the light a few weeks ago I removed the trays - there was ice - from melted water - behind the bottom tray. I removed the ice carefully. The machine is generally noisier than usual. All ideas and advice would be hugely appreciated - many thanks