Why does the connection between the APP and the Xiaomi Smart Ceiling Light D40 time out?

If the connection between the Mi Home/Xiaomi Home APP and the Xiaomi Smart Ceiling Light D40 times out, please refer to the following details:
1. The Wi-Fi password is incorrect. It is recommended that you reset the Xiaomi Smart Ceiling Light D40 and fill in the correct Wi-Fi password;
2. The network signal is bad. It is recommended that you make the Xiaomi Smart Ceiling Light D40 as close as possible to the router and reconnect it a few more times while making sure the network environment is good;
3. Bugs or glitches within the Mi Home/Xiaomi Home APP can cause the connection process to time out. Please update or reinstall the APP to resolve the issue.