I have several Kasa bulbs in the house. I have 4 KL130 in my office. I also have a KL130 in the kitchen. I have them set to circadian mode most of the time. Recently. I have found that if I set them to circadian that the connection sort of breaks. I can run another scene with a different setting and then the bulbs respond again. 

I've tried resetting bulbs several times to factory settings and from different power sources. I've tried uninstalling and reinstalling the Kasa app. I've tried deleting and recreating the circadian scene. Even if I put the bulb(s) in circadian mode then it just stops working. I have tried this on all of them. It is just this mode that seems to make them unresponsive.

I think there is a bug in the firmware.