My Yeelight Smart LED Bulb (Color) can't Turn Off

I have 4 Yeelight Smart LED Bulb (Color) and only one has a problem: when I try to turn it off with the official iPhone App, it doesn’t work. The bulb stays light on in a neutral white color, then it turns on again (on the app).

I tried to install the bulb in other places, on other lamps but it keeps doing the same thing.

I tried to reset it, to delete all the lights from app, to change my server location… I don’t know how to fix it.

Please help me or tell me if I’m not the only one…

It would be helpful if you provider a video to show it.

Ok, here’s my video: https://youtu.be/YTtwOpaoIkQ

The bulb can take like 10min to automatically lights on again, after I turned it off.

Please contact retailer for another one.