After writing a negative review below I discovered that my devices have a built in timer. My fault! Installed 10 of 12 bulbs and all failed (turned off) after a few hours. When I turned off the power for a few hours, they all turned back on when the power was restored, but a little later they went out again.
Ceiling lamp Yeelight YLXD013-B, 50 W, number of lamps: 1 pcs., color: white
62 Review
Smart bulb Yandex with Alice, base E27, 8 W, RGB color
76 Review
Lamp LED Xiaomi Mi Smart LED Bulb Warm White (XMBGDP01YLK), E27, 8 W, 2700 K
26 Review
Lamp LED Xiaomi Mi Smart LED Bulb Essential (MJDPL01YL), E27, 9 W, 6500 K
113 Review