Yeelight color bulb white not working

I’m having an issue with my yeelight.

Since I got it it doesnt work in white color properly, before I could make it work by changing brightness ramdomlesly and eventually it would work.

Now the buld wont work as white, when I select white the bulb lights up as light blue and doesnt change when I change brightness, it stays light blue for any white tone or brightness.
All other colors are working fine.

Tried to contact reseller but he refused to replace it in warranty, it’s a fairly new bulb, about 4 months.

I’m wondering if I can fix it, did anyone encounter this issue? Is it possible that a faulty white LED would cause that?