I have 15 Friends of Hue switches in use, which I only use through HomeKit. Yesterday afternoon all the switches suddenly stopped working. So I deleted one of the Philips Hue app and reinstalled it. This made no difference. I can program through the Philips Hue application and this programming then works. I can program with HomeKit, but it doesn’t work. Since I control Ikea lamps with switches, programming through Hue is of no use to me. Did anyone have an idea or something?