Hello, I just bought a 2nd generation Bedside lamp and at first I was very happy with it. During last night, after upgrading the device's firmware to the last avaiable version via Yeelight android app, I noticed that my unit produces a low buzz sound when the Color Mode or the Flow Mode are selected. The sound is very low in volume but clearly audible at 1-2 meters from the lamp. It is somewhat louder if the light is dimmed and/or set as purple hue. When in Flow Mode the buzz is persistent all over the avaiable colors.
It's my unit faulty?