@Cette
For detailed instructions on how to connect your smart bulb to your network properly via the Kasa app, please refer to our official FAQ on the subject here: https://www.tp-link.com/us/support/faq/1233/
For helpful information regarding proper configuration of the Schedule feature, please see our FAQ here: https://www.tp-link.com/us/support/faq/947/
We also recommend ensuring your router's 2.4GHz WiFi signal is adequately strong in the smart device's location. Within the Kasa Smart app there's a feature that allows you to measure WiFi signal strength of your smart devices. When the app is connected, please check the signal strength in the Device Settings menu.
If the signal is within the ideal range and you're still experiencing these symptoms, please ensure your Kasa Smart app is up to date, then update your smart device's firmware by selecting Home → Settings → Firmware Update within the Kasa app.