I have a low mileage (25,000 miles) 2015 Mazda 6 2.2 Sport Nav Tourer. I habitually have the climate control on its Auto setting, but on 30th April - just 1 month out of warranty - it started to randomly switch the Auto setting off and crank up the fan. Pushing the Auto button on again will restore it for a while, but it then goes off again. My not-so-helpful Mazda dealer, who sold the car new and has serviced it each year says it will diagnose the problem for a fee of £107, and will ask Mazda if it will consider making a contribution to repairing whatever the issue is. Can anyone shed any light on it?