Yeelight Causing Wifi Interference

I have 4 yeelight v2 color bulbs and i notice that sometimes when they are powered on either standby or lit, it causes interference with my wifi router such that my wifi loses signal for a few seconds then sometimes i have to wait a few minutes before it gets back on. My wifi router is around 2.5m away from the nearest bulb. There are 4 bulbs in the ceiling of my 4m x 7m room. Anyone experience this? What can i do to resolve this? Thanks!