I've had the appliance for around 1.5 years, use it 3-4 times a week and am satisfied. In the last few months, however, the control dial has deteriorated: setting the temperature has become very tedious, the number jumps almost at random - sometimes 10 degrees in the wrong direction. Even if you turn the dial very slowly "step by step", the numbers jump rather randomly. Does anyone have similar problems and possibly a solution? According to the app, the firmware is up to date. It seems to be something mechanical in the controller itself. Otherwise I will probably have to claim under warranty.