LED Bulb (colour) 1s keeps going offline in Yeelight app

My bulb keeps going offline in the Yeelight app after a few minutes of stationary mode. It’s like the connection is timed out or something like that. I can still turn it on and off via Apple HomeKit app but it shows the bulb as offline in Yeelight. This problem is usually solved when I switch the bulb off and on again, but I don’t want to have to do this every time I want to control it from the Yeelight app. Also, it doesn’t show up in my WiFi list, I wonder if this is connected to the problem I’m having?