I've noticed from time to time, my Phillips Hue bulbs don't always react the Alexa's commands. For example, I have 3 bulbs in my kitchen all in the same group. Occasionally when I say "Alexa, kitchen lights off", one won't react or will dim but not turn off. They are close to the Bridge and my Echo is right in the kitchen. The wifi is strong and very fast so I don't think that's the problem. I noticed there in the Hue app, there's options for different frequencies. Could that possibly help or any other suggestions would be greatly appreciated.