I had a professional electrician install 5 of the HS220 dimmer switches.  They worked great for a couple of weeks.  Now one of them won't turn off.  When you press the physical switch, it will indicate the white round circle to say the light is off, but the light no longer turns off.  The dimmer functionality doesn't work anymore either.  The switch is connected to halogen track light.  I tried controlling from Kasa app and same thing happened.  I tried deleting device and recreating and all that worked, but still can't turn off the lights. They are in my bedroom so this will be a problem.