If you find that the prompt "To guarantee auto-keystone precision, clean the ToF sensors" is appearing too frequently, try the following options:

1. Update the firmware of the 4K dongle and Cosmos Laser to the latest version:

- Press the Settings button on the remote and select Settings > Device Preferences > About > System Update.

- Press the Settings button on the remote and select Settings > Device Preferences > About > Projector Firmware Update.

2. Remove any objects in front of the projector.

3. Place the projector between 5-13 ft (1.5-4 m) away from your screen.

4. Press the Settings button on the projector or the Source button on the remote, select Image Correction, and turn off the following features: Auto Keystone Correction after Move, Manual Keystone Correction, and Auto Screen Fit.

If you still have any questions or concerns regarding this prompt issue, contact us for further assistance.