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The short answer
The usual causes are a wall switch turned off at the bulb, Wi-Fi congestion, too many devices for the router, or a hub that is too far away. Keep the switch on, move the router or hub, use the 2.4 GHz band for Wi-Fi bulbs, and update the firmware.
A smart bulb only works while it has power. If someone turns the wall switch off, the bulb goes offline. Leave the switch on, or fit a smart switch instead of a smart bulb.
Most Wi-Fi smart bulbs use the 2.4 GHz band, not 5 GHz. If your router merges the two under one name, bulbs can fail to join. Give the 2.4 GHz band its own name while you set the bulbs up. In complexes, crowded channels also cause dropouts.
Home routers handle only so many connected devices well. A house full of Wi-Fi bulbs, plugs and cameras can overwhelm it. A hub-based system takes the load off the router. See Zigbee, Z-Wave, Matter or Wi-Fi?
Bulbs and plugs may come back in the wrong state, or lose their connection. Put the router and hub on backup power. See keeping a smart home working during load shedding.
If one bulb keeps dropping while the others are fine, it may be faulty or the wrong type. Replace it before you change your whole network.
Someone may be switching it off at the wall, or your router may be restarting. Check both.
Some do, through a hub. Wi-Fi-only bulbs generally do not.
Yes, for coverage. Devices still need to be on the right band.
Switches are more reliable, because the wall switch can’t turn them off.
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