@MARCSF
Hi,
Typically, the camera switches between Day and Night modes based on lighting conditions when the video mode is set to Auto. In your case, please confirm the following information for further analysis.
1. When the reported phenomenon occurs, is the camera's video mode set to Auto?
2. If you do not reboot the camera but change the video mode to Day mode manually on the camera's live view page, will the camera display a colorful image?
3. Please send us a picture of the camera's live view page that displays the colorful image(switch from night mode to day mode) after rebooting. You can upload the picture to your cloud server (such as Google Drive) or YouTube, generate a download link, and send it to me (@Solla-topee) via a private message.
Best Regards